The Morphic environment is really getting usable. Ran into a minor problem, however.
Update 076 for Squeak 2.0, among other things, replaced Object>do: with Object>in:
The method below now needs to be changed to use in: instead of do: (it is invoked by turning a page in a book morph, for example).
Form (transitions)
wipeImage: otherImage at: topLeft clippingBox: clipBox rectForIndex: rectForIndexBlock
| index thisRect clipRect | index _ 0. clipRect _ topLeft extent: otherImage extent. clipBox ifNotNil: [clipRect _ clipRect intersect: clipBox]. [(thisRect _ rectForIndexBlock value: (index _ index+1)) == nil] whileFalse: [thisRect in: [:r | self copyBits: r from: otherImage at: topLeft + r topLeft clippingBox: clipRect rule: Form over fillColor: nil. Display forceDisplayUpdate]].
-- Matt Rosen, Director for Technical Services San Joaquin Delta College