Mechanical inspiration.

Other Hardware Motors, Mechanics, Power and CNC
1

Because from a simple turning motor so many motions in many ways are possible in simple ways.

2

Old science :wink:

http://www.pdnotebook.com/wp-content/themes/thesis_16/custom/images/Five_hundred_and_seven_mechanical_moveme.pdf

3

That's okay, I learned old math too.