Golden Mean Gadget

www.goldenmeanfinder.com is where I bought the easy-to-use tool (or toy) for applying the Golden Mean to a painting. Cost: $39.95 including shipping & handling.
Since it’s made of light weight plastic, I’m not sure how sturdy it will be in the long run. So far it has been quite handy. The Golden Mean Finder has some other tricks like establishing perspective, and finding angles.