hi frank and all, (sorry, if you get this twice, I forgot the attachement) when I play around with pyode world then I am having problems with the rotation of the objects (I think...?). I will look deeper into you example patches, but two questions: there seems to be one object in the middle of the space by default, is that from pyode? what exactly is it? and what am I doing wrong with the rotation, the objects behave a little bit strange. I attached a testpatch, so that you can see what I am doing. thanks for help. marius.