Showing my kids how phi and pi fit together

At dinner last night, I got into a conversation with the kids about pi, phi, and sacred geometry. Which is not where every family dinner goes, but ours wandered there, and I was happy to follow it. The hard part was that I could hear myself explaining something visual with too many words. Pi is easy enough to point at: circles, wheels, ripples in water, pizza if you need the obvious dinner-table…