[hencq]

I didn't realize it until I searched for it, but as a kid I did have one of those. An M.C. Escher one (a quick search found exactly the one [1]). My aunt got it for me when I was little and I was fascinated by it. Fond memories.

[1] https://www.jacobsurovsky.com/researchanddevelopment/2020/8/...