I am a display object which can both paint myself on a medium (displayOn: messages), and can act as a medium myself. My chief subclass is Form. ⇒ Medium/Form
## gtExampleEmptyForm32x32
a Bitmap ⇒ Map Varieties (Syntactic Variety in Boundary Logic. pdf 
, p. 82–84.)
> A Distinction Network can be converted into a Map by enlarging each node until neighbors touch, **constructing a common border in place of each link**. Link connectivity becomes territorial contact. Unlike circle maps and rectangle maps, both steps maps and rooms maps are anthropomorphized.
> The medium is characterized by a loose coupling between elements, which can be viewed as being dependent upon one another. Thus, the medium offers no internal resistance to forms impressing it from outside (for instance, from an object that vibrates or a reflecting surface). **The forms “condense” the connections between the elements of the medium into tight couplings, which are thus perceived by a psychic system.** The medium is formless: air makes no sound, and electromagnetic waves are not visible.
⇒ BitBlt > Forms are combined using BitBlt. See the comment in class BitBlt. Forms that repeat many times to fill a large destination are InfiniteForms.