GR8HUNTER (Tony) jogged my memory on the Fibonacci gauges I made and never posted. They set the golden ratio for a pleasing appearance to a project. I use mine quite a bit especially on tops and cabinets.
I have two of them . The last photo is the small one and it was the first. It is made from walnut and is 8" long and has pop rivets for pivot pins. The larger one is 17 1/2" overall and is made from Pistachio.