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PasteUpMorph

  1. A Morph of rectangular shape on which other morphs may be pasted. They stick as the PasteUpMorph instance is moved around.

  2. The pages of a BookMorph are PasteUpMorphs.

  3. PasteUpMorphs may have a list called steplist. In this list they keep the submorphs which need regularly the message send step.