This mirror focuses both light and sound. Light or sound approaching the mirror from faraway is essentially parallel. These parallel "rays" of light or sound are directed by the angle of the mirror to a small spot called the focal point. At that point both light and sound are concentrated.

This stand alone exhibit shows that pain sensors don’t only report damage, but also report conditions which might cause damage. The machine produces a very high frequency mechanical vibration. The motor which produces this vibration operates at around 600 Hertz (cycles per second). By comparison, electrical current from the power company vibrates at 60 Hertz.