noun
A tube-shaped optical toy with mirrors and colored objects that create symmetrical patterns when rotated. The kanji literally mean 'hundred-color glasses'.
子供の頃、百色眼鏡をのぞくのが好きだった。
When I was a child, I loved looking through a kaleidoscope.
万華鏡 is the more common modern word for kaleidoscope. 百色眼鏡 is an older or less common synonym, literally 'hundred-color glasses'.
Compound of 百 (hyaku, 'hundred'), 色 (iro, 'color'), and 眼鏡 (megane, 'glasses'). The exact origin is uncertain, but it likely arose as a descriptive term for the kaleidoscope's colorful patterns.