In the mid-1990s, Wolf Barth created his famous 65-nodal septic surface. I published my first visualizations of this more than 2 decades ago in my PhD thesis on world record surfaces. Later, my visualizations of world record surfaces became known to a wider public. Here is now my first version with a transparent background - that may be printed on a white t-shirt, hoody, or even a coffee [...]

Just recently, I have started to create my math visualizations with transparent background. The big advance is that it is possible to print them on clothes such as t-shirts, hoodies, and also on mugs, etc.