Pepper’s Ghost

How we may see in a Chamber things that are not! Here, mutations of light, through fabric, glass, and colored gel, make bodies and objects transparent. Let there be a chamber wherein no other light comes but by the door or window. Let pictures be set over against this window. For what is without will seem to be within, and what is behind the spectator’s back, he will think to be in the middle of the room, as far from the glass inward as they stand from it outwardly. Clearly and certainly, he will think he sees nothing but truth.