Picture what is actually inside the tube: a few loose pieces of coloured glass and a few mirrors. Nothing is fixed, so one small turn drops the pieces somewhere new, and the mirrors copy that new arrangement several times over. The point is not that there are many colours; it is that the picture will not stay the same twice. Every other use of the word can be thought of as growing out of that turning tube.
From the word’s history
The name was made from Greek kalos (beautiful) plus eidos (form, shape) plus -scope (an instrument for looking), and was coined by David Brewster in his 1817 patent — so the word literally says 'a thing for looking at beautiful shapes'.
這個字是用希臘文 kalós（美麗）加 eîdos（形狀）再加 -scope（看的器具）造出來的，由英國科學家 Brewster 在 1817 年的專利中命名。字面就是「看美麗形狀的器具」，所以「漂亮」和「形狀」這兩件事，從造字的那天起就在裡面了。
Wiktionary etymology supplied in packet (kaikki:3f6f69a190036ae4:775869470): Ancient Greek καλός + εἶδος + English -scope, coined by David Brewster in his 1817 patent.
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