I still remember the Pythagorean Theorem from a great teacher in Junior High School. He explained to us that this was somehow marked the three squares in the ground (in a very large fashion) to show any alien life forms coming to earth that we were intelligent life forms. Yeah, I know, the teacher was more specific about where and the exact somehow, but I can't remember. This is to show that there was intelligent life on this planet, I was not specifically talking about me!
The picture is of Olivia's playhouse that I built without plans. I used this theorem several times in the construction.
I will be moving this to UCD on Wednesday.