Kaleidoscope

Kaleidoscope is the name of an instrument invented by Sir David Brewster (1817) for "seeing beautiful pictures." It consists of two mirrors placed at an angle which is an even submultiple of 360° in a cylinder at one end of which is an eyeglass and at the other an object box formed by two glasses, between which are placed pieces of variously coloured glass. By turning the cylinder a countless number of pictures may be obtained.