As always, I also publicize my article in DeHaan Services, although "The Math of Power Sets" does not add much to this topic.
Writing Tip
When creating an image that is likely to go onto a white background, build in a strong border like the brown in today's image.
I've sometimes left the background white, and the picture just fades into the background. It's not much of a problem if the website has a strong background colour, but why count that chicken before it hatches?