Wallis Pi

Wallis99.png	Wallis99ga.png	WallisAaNa.png	WallisB.png	WallisBall25.png
WallisBall50.png	WallisBall9.png	WallisDflt.png	WallisWl.png

I found this article in the news which lead me to search for some explanation of how the Wallis product makes pi and found this (I couldn't be bothered with the 'modern' integral calculus proofs) which set me to creating a postscript file and an OpenSCAD file from which these images derive. (Download these two links and view them in your favorite text editor if your browser doesn't load them as text.) I kind of created the Postscript file as I worked my way through the proof which, for me anyway, was not so elementary. It seemed natural to want to make the 2D images pop into the third dimension!