In an otherwise empty lab on the CU Boulder campus, a musician and a scientist stand 12 feet apart in separate rooms, an open door between them. The musician crouches next to a small, round mirror, the side of his unmasked mouth appearing in the reflection.
“Now say the alphabet,” says Abhishek Kumar, a graduate student in mechanical engineering, as he adjusts the focus on a digital video camera, points it at the mirror and hits record.
“A, B, C, D, E . . .,” the musician recites.
Kumar then asks the musician to stand on a step stool, positioned with the bell of his clarinet—the flared part at the end where the sound comes out—in front of the mirror.
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Image via Glenn Asakawa/University of Colorado.