Phi Ruler Golden Ratio ruler set “The Phi Ruler was first launched on Kickstarter in 2019 and we were so grateful that we had more than 900 backers supporting our project and delivered worldwide.

11:33 am September 15, 2020 By Julian Horsey Designer Ming Lo has created a new sketching ruler in the form of the Phi Ruler, offering a Golden Ratio ruler for “harmony creation”.