[isotropy]

Trying to explain is dodgy - it never works for jokes, either. But I think they represent a bundle of interesting contrasts that hits a sweet spot for a lot of us. Most people have made a Mobius strip out of ephemeral paper and thrown it away after fiddling with it; these are hard-wrought, complex artisinal craftings from the same family of ideas. The idea of "Klein bottle art" at first sounds rigid and limited, but the variation shows lovely creativity and artistic sense. They riff off the low humor of a dribble glass by mixing it with the sophistication of advanced math. The artist stays down-to-earth and accessible, even though he's clearly walked quite a way down a particular road of practice and experimentation that the rest of us are only going to admire from afar.