kaleidoscope: [19] Greek kalós meant ‘beautiful’ (it was related to Sanskrit kalyāna ‘beautiful’). It has given English a number of compound words: calligraphy [17], for instance, etymologically ‘beautiful writing’, callipygian [18], ‘having beautiful buttocks’, and callisthenics [19], literally ‘beauty and strength’. The Scottish physicist Sir David Brewster used it, along with Greek eidos ‘shape’ and the element -scope denoting ‘observation instrument’, to name a device he invented in 1817 for looking at rotating patterns of coloured glass – a ‘beautiful-shape viewer’. => calligraphy, callisthenics
kaleidoscope (n.)
1817, literally "observer of beautiful forms," coined by its inventor, Scottish scientist David Brewster (1781-1868), from Greek kalos "beautiful" (see Callisto) + eidos "shape" (see -oid) + -scope, on model of telescope, etc. They sold by the thousands in the few years after their invention, but Brewster failed to secure a patent.
Figurative meaning "constantly changing pattern" is first attested 1819 in Lord Byron, whose publisher had sent him one of the toys. As a verb, from 1891. A kaleidophone (1827) was invented by English physicist Sir Charles Wheatstone (1802-1875) to make sound waves visible.