In The bbc programe James mays toy stories, what is the meaning of the crazy "exercises" the sculptist does? - legs from toy story

In this episode, what is the meaning of the strange things that do, the sculptor James and mussels plastercine? (The legs in the air, as opposed to painting with the mouth and flows of paint)

Heres the link

http://www.bbc.co.uk/iplayer/episode/b00 ...