I've logged a lot of hours using a drafting triangle. The kind with 30, 60 and a 90 degree angle. This triangle became the inspiration for my Table Topper pattern, "Fly a Kite".
I have a round coffee table, and I thought I should make a topper reversible to get double duty and have different color ways on each side. The result was Fly a Kite. Here it is on our Moroccan coffee table ... and again on a white board showing the second side.