Keystone Bridge

For this assignment my mother still wasn't letting me go outside, so instead I designed a bridge easy to replicate containing a keystone- so it could be load bearing. Here's an example of a one found in the real world.
Image result for keystone bridge

according to google define, a keystone is "a central stone at the summit of an arch, locking the whole together." So I sent my dad outside with an ice cube tray and this design: 


and the final product looked like this:



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