A kaleidoscope is a toy in the shape of a tube with a small hole at one end. If you look through the hole and turn the other end of the tube, you can see a pattern of colours which changes as you turn the tube round.
N-SING
（色彩、成分等的）千变万化，瞬息万变
You can describe something that is made up of a lot of different and frequently changing colours or elements as a kaleidoscope.