Hi Lukas. I was serializing Pier kernels with Fuel and I started to face problems with Magritte proxies. Since I have no idea how/why they are use, I need to ask a couple of question. Imagine I want to serialize a graph (like a Pier kernel) that contains instances of MADynamicObject, like MAMultipleOptionDescription new default: [ self defaultViewClasses ] magritteDynamicObject; options: [ self defaultViewClasses ] magritteDynamicObject; .... So the questions are: - When I MATERIALIZE the graph, would you like to a) still have the proxies exactly as it was during serialization ? b) or would you expect that objects refer directly to the target of the proxy (proxies do not even exist) ? If you want a) then there are problems that I have to fix because for example I put objects (proxies) in a IdentitySet/IdenitityDictionary (which of course #== is not intercepted by the proxy) but then when I do #instVarAt: or #basicAt: etc, from the serializer, it intercept the messages and forwards to the target. This makes things complicated in Fuel but we can solve it. b) can be achieved with the hook of a #objectToSerialize where each class can implement such message and not necessary answer self but something different. In this case, the proxy can answer the target. So....depending what is the best scenario for the materialization, I can choose which of the options to do. Thanks in advance, -- Mariano http://marianopeck.wordpress.com