Oups! you're right. that's the problem! I am trying to make a dragon curve.

Transform! executes/calls the method wheras transformation = is assigning it. tested your code and transformation = , did give me a same result as transform! The principle still is call method with object.method. Oh, and to answer the question. In this case were dealing with Geom::Transformation object. So were not calling a method directly(I think..).So its more like Group.Geom::Transformation = myspecial.Geom::Transformation I hope I explained it correctly.. If you test t0.class you will see it's a Geom::Transformation.object