A toy kaleidoscope tube
A toy consisting of a tube containing mirrors and pieces of colored glass or paper, whose reflections produce changing patterns that are visible through an eyehole when the tube is rotated.

Image via Wikipedia
I remember having these as a child.  It was fascinating and magical for me.
Try this link.  The images move quickly so be prepared.  If you move your mouse it changes even faster!

I found this on the"Aging Gratefully" blog

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