Friday, September 4, 2026
Smell & Tell | Inside the Writer's Study (A Mystery in Seven Scents)
Monday, June 29, 2026
Research Paper Puts Sensory Evaluation in the Higher Ed Classroom
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| Armonía (Harmony) by Remedios Varo (1956) |
A peer-reviewed paper I co-authored with collaborators at the University of Michigan is published in the current edition of the Journal of Statistics and Data Science in Education (JSDSE). The paper outlines a pilot educational module at the University of Michigan that integrates machine olfaction into an undergraduate deep learning course. By combining chemistry, machine learning, and sensory evaluation, the curriculum challenges students to work with subjective sensory data, demonstrating the feasibility of teaching multimodal data science.
The inclusion of sensory evaluation in a deep learning course is novel as far as papers accepted by JSDSE go. The good news is that our pedagogy-driven endeavor doesn't end with our paper. Dr. Ambuj Tewari received a second New Initiatives/New Instructions (NINI) grant from the University of Michigan that will allow us to take our findings to the next level (which is why I'll be busy teaching this summer).
Curious? Read the paper and sniff out the facts in the sensory evaluation portion. Readers of Glass Petal Smoke who work in the flavor and fragrance industry will appreciate it. Perfume fans may also find it interesting, and don't have to worry about decoding a research paper. It's all about learning in small incremental steps. The more you do it, the better you get at it.
Citation: Han, Y., Kydd, M. K., Ward, J., & Tewari, A. (2026). Teaching Machine Olfaction in an Undergraduate Deep Learning Course: A Pilot Integrating Chemistry, Machine Learning, and Sensory Evaluation. Journal of Statistics and Data Science Education, 34(3), 372–380. https://doi.org/10.1080/26939169.2026.2665103
Notes & Curiosities
Teaching 100+ students in a large auditorium how to evaluate smells using fragrance blotters was and remains one of the most satisfying teaching experiences I've had at the University of Michigan to date. It proved what I've always known by experience; that sensory evaluation is a powerful multisensory teaching and learning tool when combined with other disciplines. The sense of smell is memory's sense; it doesn't get more pedagogical than that.
I have many students to thank with regard to the evolution of Smell & Tell lectures, especially those that were part of summer boot camps held by MSTEM Academies at the university. Thanks also go out to students who invited me to give a TEDxUofM talk in 2015 (a talk that resonated with a wider audience after the COVID-19 pandemic) and students who shared their anosmia and congenital anosmia stories with me after the event.
BTW: One of the reasons why Dr. Tewari and I ended up collaborating was the presence of my TEDxUofM talk online; the rest, as they say, is history.
I would be remiss if I didn't thank the Ann Arbor District Library for saying yes to monthly "Smell & Tell" events in 2012, and every year afterward. There isn't a day that goes by that I don’t forget how much creative freedom the library gives me. Honestly, writing this post makes me feel like I'm dreaming with my eyes open.
Saturday, November 1, 2025
Eau Maybe: Inspiration for Dr. Carruthers Character in The Devil Bat (1940)
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| Bela Lugosi as Dr. Carruthers, a perfumer, in The Devil Bat (L), and Dr. Wallace Hume Carothers, a chemist, as himself (R). |
Friday, August 29, 2025
Marcel Duchamp & Georges Perec Write a Faux Fragrance Article in the Afterlife
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Image of Grey-Crowned Cranes by Frankie from Germany via Pixabay |
Part I: The Article
A novel line of seven perfumes is created by an eclectic perfumer. Each is named “smell” in a non-English language. The olfactive noun appears in calligraphic script on each of the labels with a foreshadowing twist. Ingredients in the formula are procured from the country of origin where the language on the bottle is spoken.
Monday, May 12, 2025
The Meaning of Things Left Inside the Pages of a Book
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| Still Life with Guitar by Juan Grís (1920) |
Item 1: Olfactory-rich text in the “Doldrums” chapter of Tristes Tropiques by renowned anthropologist Claude Lévi-Strauss (left) and a light blue-green “Swimming SW6764” paint swatch used as a bookmark (right). The passage is beautiful, fragrant and highly sensorial. I long for a bottle of its perfume after reading it, a sentiment I had when I first came across the passage 12 years ago.
The traveler approaching the New World is first conscious of it as a scent very different from the one suggested back in Paris by the connotations of the word Brazil, and difficult to describe to anyone who has not experienced it.
At first, it seemed that the sea smells of the preceding weeks had ceased to circulate so freely; they had come up against an invisible wall: thus immobilized, they no longer claimed the traveler’s attention, which was now drawn towards smells that were of a quite different nature and that nothing in his past experience enabled him to define: they were like a forest breeze alternating with hot-house scents, the quintessence of the vegetable kingdom, and held a particular freshness so concentrated as to be transmuted into a kind of olfactory intoxication, the last note of a powerful chord sounded separately as if to isolate and fuse the successive intervals of diversely fruity fragrances. This can only be appreciated by someone who has buried their face in a freshly cut tropical red pepper, after having previously, in some botequin of the Brazilian sertão, inhaled the aroma of the black honeyed coils of the fumo de rolo, made from tobacco leaves, fermented and rolled into several lengths several yards long. In the blend of these closely allied scents, he can recognize an America, which, for thousands of years, was alone in its possession of their secrets.
But when, at four o’clock in the morning of the following day, the New World at last appeared on the horizon, its visible image seemed worthy of its perfume.
Lévi-Strauss, Claude. Tristes Tropiques. Trans. John and Doreen Weightman. New York: Penguin Classics, 2012, page 78.
Leví-Strauss’ words enter and exit the reader’s mind with the dreamy languor of incense smoke. Transforming the passage into a perfume (an ephemeral creation that triggers and inspires memories) makes perfect sense. The book, originally written in French, was published in 1955. Translations exist, but the same can’t be said for the creation of a perfume based on the excerpt—70 years later.
The second item I found is a pattern made by randomness. A train ticket covering a page of haiku is engaged in a visual dialogue with a painting on the opposite page. I didn’t make a connection at the time, as the ticket served as an ad hoc bookmark when the train was pulling into the Larchmont Metro-North train station in Westchester County.
Item 2: A Japanese brush painting titled “Shoots of the Horsetail Plant” by Saitô Shôshû (left) is situated opposite a New Haven line Metro-North Railroad ticket, circa early 2000 (right). The painting, which is next to four unseen haiku beneath the train ticket, uses the same shades of red and black ink found on the commutation ticket. The item on the left is art; the item on the right is art by association.
I’ve taken the New Haven line infrequently and am better acquainted with the trees, shrubs, plants and long grass that grow alongside the riverside tracks of the Hudson line across from the Palisades. Though I recall specific seasonal views, memories of 14 years of commuting to and from Hastings-on-Hudson and Grand Central Terminal on the Metro-North have merged.
My mind connects commuting experiences by type versus single experience, unless there's an experience worth recalling that breaks through the monotony of routine commuting. The fact that eidetic memory isn’t common makes sense as it would be a recipe for hell if we remembered everything. One part Sherlock Holmes knack, the other a not-so-friendly invitation into a well-fitting straitjacket with less time to live in the present.
It's interesting how the way we think and remember is reflected in the material things we hold onto. Each item saved serves as a potential catalyst for reminiscence that allows us to organize personal meaning with agency as a witness to our own life.
This is particularly important when the people who raised us, the archivists of our lives, are no longer here to answer questions about our past that inform our present life. In this respect, meaningful things we save don't leave us empty-handed until we decide that they don't change the fact that unanswered questions are a part of life.
I've begun collecting security envelopes that accompany bills, the kind with designs on the underside that obscure the contents inside the envelope from being seen on the outside. Common designs include confetti, linen, burlap and crosshatched patterns printed in blue or black ink. Once in a while, a security envelope with an ornamental pattern arrives and breaks the monotony.
I consider repetitive patterns in nature and stumble across an unexpected find. A recording of Salvador Dalí talking about logarithmic patterns in relationship to the unique spiral pattern of a rhinoceros horn (an obsession of his).
Then it becomes clear to me. It's not the safety aspect of security envelopes that I'm attached to, it's the meaning of patterns and the way they connect and disconnect in earthly and spiritual ways. It's why I can't help wondering whether Dalí, an artist fond of using found objects in his sculptures and assemblages, left traces of his personal life behind in the pages of the books he owned.
Notes & Curiosities
It's not uncommon for secondhand booksellers to find personal items inside copies of used books sold by their previous owners. There isn't an all-encompassing word for the items found inside a previous owner's books as contents vary, though most are relics of life experience. Glass Petal Smoke leans towards "personalia" as it complements marginalia. Curious about what people leave inside their books? Begin by searching for "things booksellers find inside used or antiquarian books".
Note to haiku lovers. The second "find" in this story was located in A Net of Fireflies: Japanese Haiku & Haiku Paintings, translated by Harold Stewart.
Monday, March 3, 2025
Recommended Reading: The Forgotten Sense by Jonas Olofsson
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| Peter Sellers as Inspector Clouseau via Encyclopedia Britannica |
Sunday, November 24, 2024
Anatomy of a Tic Tac Orange Mint
Mass-produced candy ensures a specific eating experience every time and that's by design. Candy is a form of comfort and reward across cultures. When you eat candy, you expect it to taste exactly like you remember it. The everyday chaos of adult life is sublimated by candy's constancy. Add a few childhood memories and it's easy to get hooked on candy when you’re decades past being a kid.
Sunday, November 3, 2024
Ethyl Maltol Goes to a Cocktail Party
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| Image Credit: Candy-Floss Coneheads via Ylvers on Pixabay. |
Monday, April 22, 2024
Falco Riot and Octyl Fora Go Missing
We're playing those mind games together,Pushing the barrier, planting seed.Playing the mind guerrilla,Catching the mantra "peace on earth".We all been playing those mind games forever,Some kind of Druid dude, lifting the veil.Doing the mind guerrilla,Some call it magic, the search for the grail.
Monday, April 1, 2024
Scent in Film: The Scent of Earth by Amit Dutta
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| Scene in an Indian perfume shop from The Scent of Earth, a short film by Amit Dutta (2021). The film captures the essence of episodic memory. |
The Scent of Earth by Amit Dutta utilizes stop-motion animation to explore the smell of rain on parched earth at the start of India’s monsoon rain. The narrator in the film articulates encounters with the aroma in childhood memory vignettes that reawaken and crystalize when he discovers a flask of mitti attar ("earth perfume") at a bazaar by chance. The essence, a codistillation of earthen pottery and sandalwood, is imbued with the scent of the landscape and a history of encounter with a centuries-old style of perfumery.
Smells, as an experience, aren't permission based. They are perceived as the autonomic result of breathing. We neurologically detect smells before we can describe them and it happens in a flash. Molecules that comprise smells make physical contact with olfactory receptors, generating memories and emotions before they can be expressed as language. James McHugh captures the liminal quality of smell when he writes: "Smell has the strange, almost paradoxical, nature of being both a remote sense and a contact sense."
Amit Dutta brings a clear understanding of the embodied aspect of smell throughout The Scent of Earth. The voice and storytelling style of the narrator (it’s the filmmaker's) are gentle, relaxed and guileless. This makes the portrayal of smell relatable to anyone who’s ever experienced a meaningful scent in all its timeless profundity. Mitti attar is the catalyst for awakening memory and inspiring storytelling, which in turn touches on the art of perfume making in Kannauj. It’s a thoughtful admixture of scent, culture and film.
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Mitti kulhad (earth cups) made from unfinished clay are fired in a kiln, broken into shards, and used to make mitti attar. Whole cups, which are designed for drinking tea, impart an earthy flavor. |
Viewers experience the transporting quality of smells through the speaker’s visual and articulated memories as they follow the narrative arc of the film. The script has a literary flavor when extracted from the film, which is just over two minutes long:
"In my childhood, one smell that affected me the most was the scent of the earth when it rained for the first time after a hot summer. The smell was so subtle that sometimes I wondered if it existed at all.
Everybody felt it, but no one ever expressed it. It was difficult to articulate that scent. I did not pay much attention to it and eventually forgot about it.
Many years later, in a small bazaar, I saw a small bottle of perfume. The label was in Hindi and it said ‘Earth Perfume'. It made me curious when I smelled it; it was exactly the same smell that I experienced in my childhood.
With it, memories of my childhood also came back, not as one particular incident, but as various assorted images. I saw myself going back to school in a horse-cart, my mother teaching at the same school, the school that was close to the border.
There were a few destroyed tanks and bunkers, reminiscent of old wars. The broken tanks and bunkers had gathered dust, colorful flowers grew on them. Rain fell on those flowers and gave out the same scent.
The shopkeeper told me that this scent was made in Kannauj, where they have been making it for centuries. What fascinated me was the scent, which I even failed to spell out, was experienced by someone in ancient India, who tried to capture it and succeeded!
I bought that bottle, and with it my childhood—in a small bottle."
The duality of terrestrial experience (the smell of rain on parched earth) and the ability to distill the terrestrial (sandalwood and shards of fired earthen clay) bookend the narrator's sense of wonder at the close of the film. The Scent of Earth is a filmic ode to its namesake. What we are left with is proof that the extraordinary can be found in something as ordinary as dry earth that crumbles between the fingers like dust, and smells of the heavens in the rain.
Monday, March 25, 2024
Algorithm This: A Math of the Senses
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| Untitled (c.1980) ©Paulina Peavey Estate / Andrew Eldin Gallery, NYC |
Monday, March 18, 2024
The Scent of Morphia and Confabulation
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| Stripped Cat by Léonard Tsuguharu Foujita (1924) |
Our story begins and nearly ends for a cat, introducing us to its peculiar owner and an unsavory trick he played on the feline with the express purpose of ending its life. Consider the following four points before engaging with the tale:
- № 1: Cats. They’re an interesting subject because they’re cats. And they let you know it.
- № 2: People. Always hiding behind the mask of personality. Some are more convincing than others.
- № 3: Writers. They’re observant and take notes. Make acquaintance with one and you may appear as a character in one of their stories.
- № 4: Doctors. Most are guided by the Hippocratic Oath. Others are gilded by reputation, clever accountants and club memberships.
I HAD a favourite cat which was having fits and becoming dangerous, so, to destroy it as painlessly as possible, I inserted several grains of morphia in the centre of a piece of foie gras which was cut in two, great care being taken that no morphia was split on the outside. The cat on being shown the foie gras expressed in every way its eagerness for it, but when it got within three feet of the foie gras, turned round and looked at me with intense astonishment, and then after another sniff walked away, though previously it had always worried for a small piece. The special point is that the cat could detect something dangerous though the strong smell of the foie gras, though morphia, even in considerable quantities, has to most persons only a faint odour.
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| Concluding paragraph in the British Journal of Ophthalmology by J. Herbert Parsons, August 1920. Ibse dixit refers to an unproven assertion. |
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| Image of Dr. Edridge-Green via The Royal College Surgeons of England |
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| Via the National Institute of Health, National Library of Medicine |
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| The Latest Application in Scientific Principals by Louis Wain |
Among the treasure trove of referee reports is one by physicist Shelford Bidwell (inventor of a precursor to the fax machine) about a paper on 'The evolution of the colour sense' by Frederick William Edridge-Green in 1900. Bidwell describes the author as ‘a crank’, and the paper as not only plagiarized but also ‘rubbish of so rank a character that no competent person could possibly take any other view of it’:"Having long ago recognised in him all the well-known characteristics of a 'crank', I have carefully avoided entering into any discussion with him or expressing any opinion as to his views."
He then goes on to suggest that if the Society takes issue with ‘this admission of bias’ they should refer the paper to someone else. Edridge-Green’s tests for colour blindness were nonetheless adopted by the Royal Navy.
The report by referee Shelford Bidwell, including the summary, reveal a lack of professionalism and ethics on the part of Dr. Edridge-Green. It was issued 32 years before the doctor wrote to Nature about the alleged cat episode. F.W. Edridge-Green died on April 17, 1953. His obituary in the British Journal of Ophthalmology refers to the doctor as “a controversialist” whose conclusions sometimes lacked the basis of fact. There is no mention of family left behind in Edridge-Green’s obituary. Not even a cat.
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| Maréchal Niel Roses by Henri Fantin Latour(1883) The flowers have a strong raspberry, tea and violet scent. |

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