Just something weird I made when I was playing around with the pen. Hope you enjoy! Use arrow keys to go through the drawings. Right now there are 10 (including drawing 0). Drawing 3 has a really cool 3D effect, which I made by utilizing the modulus of the x and y positions of the pen. Sorry loading the drawings is a bit slow. The project has to calculate and render every pixel individually.
100% by me, and 100% pen. There are probably drawings like this elsewhere because they're pretty basic calculations.