Last updated at 11:21 pm UTC on 6 June 2018
A Morph may contain other morphs. They are in a collection called 'submorphs' ("child nodes").
m := Morph new openInWorld.
The result of print-it is
i.e. no submorph.
is used to add a submorph.
Example - aMorph addMorph: anotherMorph