Bill Ward on a room that is 99.9 percent sound proof:

Besides being able to hear one’s own heart, stomach and even inner ear, or the sounds emitted by a cellphone’s display, first-timers in the quiet room find their other senses discombobulated by “cross-modal” perceptual effects.

“Your eyes don’t feel as comfortable in this room,” Orfield pointed out, adding that some visitors have had hallucinations during or after a spell in there. “You lose your touchstones.”

You have no idea how badly I want to see how long I could last in this room.