One particularly effective display shows how perception shifts . Press the top button, and you get a whiff of old, cold coffee, stale grounds in a soggy filter at the end of the day. Press the bottom button, and you get a noseful of real skunkiness, furfuryl mercaptan. But press both buttons at once, and the two unpleasant compounds blend together to evoke fragrant, fresh-roasted coffee.
— The new Museum of Food and Drink in Brooklyn features a number of smelly items in their inaugural exhibit, Flavor: Making It and Faking It. Read more at This Smell Synthesizer Lets You Sniff And Play Flavors Like Music at Popular Science.