[Pharo-users] drawing morphs with athens

Hello, I'm currently working on drawing engine (à la Squeak Connectors) as a part of school project and have a couple of questions about Morphs and Athens and would be grateful if someone could enlighten me. What is the difference between "Morph>>#drawOn:" and "Morph>>#drawOnAthensCanvas:" if I draw on AthensCairoSurface? Should I always use the latter or will there be switch to the former once everything is rendered using Athens? Should AthensMorphWrap be around every morphic element or just the top level? i.e. CanvasMorph (owner of the surface) will have a single submorph AthensMorphWrap which will then hold all the morphs (EllipsisMorph, RectangleMorph, ...) which are being drawn on the canvas. Thanks, Peter