When my parents visited New York, I gave them a tour of my favourite scents in the shop. This took some time: the accords include clever riffs on the smell of rubber, from the intoxicating Inner Tube to a just-short-of-noxious Rubber Cement. Equally impressive is Wet Pavement, which strikes me as wearable, even pretty. Burning Leaves is startlingly alluring, and Ink smells so authentic that I held up the bottle to show my mother that the fluid was clear and not an indelible blue. Roast Beef is predictably revolting, but still a must-smell. My mother lingered over In the Library, a blend that Christopher describes as “First Edition, Russian and Moroccan Leather, Binding Cloth and a hint of Wood Polish”.

Tomato, for example, was found to be an odor absorber. Some of the edible fragrances are said to help curb cravings. And though the company has yet to perform psychological tests, researchers said the Dirt fragrance made Alzheimer patients more lucid.