Morph subclasses size 44 Morph allSubclasses size 392 (in 3.3a-4769)
Morph is the base class of everything that can be displayed in a World and of what you can interact via a hand. Examples of Morphs are rectangles, windows, balloons etc. This is an intuitive notion, and the pragmatics have several angles.
If we look at the instance variables, Morphs have bounds and can contain other morphs as submorphs. The morph's own bounds merged with the submorphs' bounds is called fullBounds.
As each morph can be a submorph of another morph, it has an owner.
Every morph is directly or indirectly owned by the World. The only exceptions are morphs picked up by the hand. Their owner is a hand which is not part of the world.