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WorldMorph
The WorldMorph is the topmost morph which contains all other Morph instances. It keeps a list of morphs which need stepping and sends them a stepping message when the scheduled time has come.
Since Squeak version 2.5 there is no WorldMorph class anymore. Instead a message isWorldMorph was added to PasteUpMorph. A PasteUpMorph may now serve as a WorldMorph.
It seems that Morphic is a very interesting simulation framework.
Interesting method to explore
runStepMethod