∅

http://youtube.com/watch?v=-Kq03KxFKho
Bas Jan Ader, Broken Fall (Geometric)

Bas Jan Ader, Broken Fall (Organic)

http://youtube.com/watch?v=NRHba4IAdsI
Bas Jan Ader, Fall III

http://youtube.com/watch?v=vUzBCl6iVoc
Bas Jan Ader, I'm too sad to tell you (1971)