Interesting. What lies beyond the wall?

Being a sheet metal worker I made a career out of pattern generation. No real serious math you couldn't do with a compass and square. In fact math for large objects and structures could only be done using them. The school taught math only works on paper. Long story short.. Intersecting lines is also part of it.. The sun is a lot closer than most people think..

Exactly, friend...anyone having had any technical training, engineering, architecture, construction, working with math :), would easily surmise that it is not a globe...sextants, anyone...