Stood in front of the Twelve-Angle Stone for like 20 min. The tourists don't get it

Hatunrumiyoc street in Cusco, the famous Piedra de los Doce Ángulos. Everyone lines up, takes the photo with the guy in Inca costume, leaves in 90 seconds. I stayed. It's one block of green diorite, ~6 tons, with TWELVE distinct angles cut into it, and every single one mates perfectly with the surr……