A classical piece of mathematical art is a glass Klein bottle. I believe it was Spring 2019 when I went to a glass art workshop at Georgia Tech, where I made the following glass Klein bottle and glass Möbius strip (although my glass versions might be different from the classical versions).

A glass Klein bottle The term “bottle” in Klein bottle (Klein Flasche) is actually a translation error for the German word for surface (Oberfläche).
My glass Klein bottle.
A glass Möbius strip Why did the chicken cross the Möbius strip? To get to the same side!
My glass Möbius strip.