World's largest penny pyramid

Well, I know what the next bot I build is going to do.

What I’m fascinated by is that the pyramid created by those 11-penny stacks appears taller than it is wide. The actual diameter-to-thickness ratio of a penny is a little over 13:1. A 13-penny stack should create a fairly square pyramid. 11-penny stacks should create a squat pyramid that’s noticeably wider than it is tall. But instead, it looks stretched.

An 11-penny stack creates the illusion of being taller than it is wide. (A “square” 13-penny stack looks ridiculously tall compared to width.) But at that scale and distance the cylinder illusion shouldn’t be coming into play.

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