kaleidoscope -
A constantly changing set of colours, or other things.
Wikipedia
A kaleidoscope is a tube of mirrors containing loose, colored objects such as beads and pebbles. The viewer looks in one end and light enters the other end, reflecting off the mirrors. Coined in 1817 in English by its inventor Sir David Brewster, the word "kaleidoscope" derives from the Ancient Greek καλ(ός) (beauty, beautiful), είδο(ς) (form, shape) and -σκόπιο (tool for examination), and it literally translates to "observer of beautiful forms.".
OmegaWiki Dictionary
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kaleidoscope A cylinder with mirrors containing loose, colored objects such as beads or pebbles and bits of glass.