According to
Wikipedia:
A kaleidoscope is a tube of mirrors containing loose coloured beads, pebbles, or other small coloured objects. The viewer looks in one end and light enters the other end, reflecting off the mirrors.
According to the Random House Dictionary, © Random House, Inc. 2010:
–noun
1. an optical instrument in which bits of glass, held loosely at the end of a rotating tube, are shown in continually changing symmetrical forms by reflection in two or more mirrors set at angles to each other.
2. a continually changing pattern of shapes and colors.
3. a continually shifting pattern, scene, or the like: The 1920s were a kaleidoscope of fads and fashions.
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