One shape goes through three holes : square, circle, triangle.

I made a real toy out of it. :)
As seen on Twitter.
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Compare with this other solid.
[url=https://www.geogebra.org/m/znyms8tp]geogebra.org/m/znyms8tp[/url]
– Vincent Pantaloni

Information: One shape goes through three holes : square, circle, triangle.