Andreas/Phil,
Wouldn't another possilble approach be to create a series of pictures showing all the possible positions of the pendulum and then control it as one would control a cartoon/movie? (Phil - There are examples of this technique at squeakland.org under the eToys link.) Another option that comes to mind is to stack each of these pictures on top of each other and move them front to back as required. Andreas, I'm new to Squeak -- would these ideas work, or am I on the wrong track?
Thanks, Bruce Strothenke Teachers College Columbia University