How to Paint Convincing Patterns on Round Pottery Without Trigonometry : Ceramic Arts Daily

Painting a repeating pattern on a round vessel presents challenges. To be convincing, the pattern needs to expand proportionally with the roundness of the pot. Tony Merino wanted to do this, but really wasn’t too excited about revisiting high-school trigonometry class. So he set out to find an easier way, and he did.
Clink link below to read full article:
http://ceramicartsdaily.org/pottery-making-techniques/ceramic-decorating-techniques/how-to-paint-convincing-patterns-on-round-pottery-without-trigonometry/