Clockwise turn: http://www.youtube.com/watch?v=HgYcslSf8xw
Counterclockwise turn: http://www.youtube.com/watch?v=nhqRLap_4WM
Clockwise square: http://www.youtube.com/watch?v=Csshay1kEqs
Counterclockwise square: http://www.youtube.com/watch?v=2HVwIpXvSso