I presume you know the story of Feynman and spinning plates [1]. Sense of play is important for productivity, sometimes it is more than just important, it becom

I presume you know the story of Feynman and spinning plates [1]. Sense of play is important for productivity, sometimes it is more than just important, it becomes a necessity [1] http://www.physics.ohio-state.edu/~kilcup/262/feynman.html http://www.physics.ohio-state.edu/~kilcup/262/feynman.html The diagrams and the whole business that I got the Nobel Prize for came from that piddling around with the wobbling plate. -- Richard Feynman