kaleidoscope

Concise Oxford English Dictionary © 2008 Oxford University Press:
kaleidoscope /kəˈlʌɪdəskəʊp/

▶noun

• 1 a toy consisting of a tube containing mirrors and pieces of coloured glass or paper, whose reflections produce changing patterns when the tube is rotated.

• 2 a constantly changing pattern or sequence.

– derivatives
kaleidoscopic adjective,
kaleidoscopically adverb.

– origin C19: from Gk kalos ‘beautiful’ + eidos ‘form’ + -scope.