Good read also...

FLW and the Johnson Wax Project...

Proof Testing his "Lily pads"

https://www.cnet.com/pictures/why-frank-lloyd-wright-piled-60-tons-on-a-lily-pad-pictures/

I do lots of Proof Testing in my world.

If you are not actively engaging EVERY enemy you encounter... you are allowing another to fight for you... and that is cowardice... plain and simple.