Some years ago I saw something unusual at a flea market. It was a type of kaleidescope that you put a slid a piece of multicolored fabric through a slot on the side. When you looked into the kaleidescope it made the fabric appear as a geometric pattern that could be altered by moving the fabric through the slot.
The seller told me it was used by people to create geometric quilt patterns.
I'd love to find one of those kaleidescopes,. Can anyone offer any thoughts on the subject?