I think you're missing the point. An object and child hierarchy is too high level for what I'm suggesting. Just expose the graphics library and let the programmers handle the rest. If you want something hierarchical that's simple and efficient to move an object and all its children around, great. You write that for your applications. Make it into a framework if others want to use it. But if somebody wants to use a different approach for their application, they should be able to do so.
