In 1984, I drew the sketch below (the actual original size is less than three inches square) as a test for an elaborate border for a future drawing. I abandoned the idea -- I don't know why -- and have not revisited it until now.
Recently, I have discovered time lapse videos on YouTube of artists drawing in Adobe Illustrator. I find them fascinating and have given up hours to watch other artists draw. One of them, however, was a tutorial on Illustrator's pattern brush tool. Following the artists instructions, I converted the 29 year old sketch into the mandala above. Amazing.