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.

	coloring
	fill:fillColor: fill:rule:fillColor: fillBlack fillBlack: fillColor: fillGray fillGray: fillShape:fillColor: fillShape:fillColor:at: fillWhite fillWhite: fillWithColor: reverse reverse: reverse:fillColor:

	displaying
	copyBits:from:at:clippingBox:rule:fillColor: deferUpdatesIn:while: drawLine:from:to:clippingBox:rule:fillColor:

	bordering	top
	border:width: Paint a border whose rectangular area is defined by aRectangle. The width of the border of each side is borderWidth. Uses black for drawing the border.
	border:width:fillColor: Paint a border whose rectangular area is defined by aRectangle. The width of the border of each side is borderWidth. Uses aHalfTone for drawing the border.
	border:width:rule:fillColor: Paint a border whose rectangular area is defined by aRectangle. The width of the border of each side is borderWidth. Uses aHalfTone for drawing the border.
	border:widthRectangle:rule:fillColor: Paint a border whose rectangular area is defined by aRectangle. The width of each edge of the border is determined by the four coordinates of insets. Uses aHalfTone and combinationRule for drawing the border.

	coloring	top
	fill:fillColor: Replace a rectangular area of the receiver with the pattern described by aForm according to the rule over.
	fill:rule:fillColor: Replace a rectangular area of the receiver with the pattern described by aForm according to the rule anInteger.
	fillBlack Set all bits in the receiver to black (ones).
	fillBlack: Set all bits in the receiver's area defined by aRectangle to black (ones).
	fillColor: Set all pixels in the receiver to the color. Must be a correct color for this depth of medium. TK 1 Jun 96
	fillGray Set all bits in the receiver to gray.
	fillGray: Set all bits in the receiver's area defined by aRectangle to the gray mask.
	fillShape:fillColor: Fill a region corresponding to 1 bits in aShapeForm with aColor
	fillShape:fillColor:at: Fill a region corresponding to 1 bits in aShapeForm with aColor
	fillWhite Set all bits in the form to white.
	fillWhite: Set all bits in the receiver's area defined by aRectangle to white.
	fillWithColor: Fill the receiver's bounding box with the given color.
	reverse Change all the bits in the receiver that are white to black, and the ones that are black to white.
	reverse: Change all the bits in the receiver's area that intersects with aRectangle that are white to black, and the ones that are black to white.
	reverse:fillColor: Change all the bits in the receiver's area that intersects with aRectangle according to the mask. Black does not necessarily turn to white, rather it changes with respect to the rule and the bit in a corresponding mask location. Bound to give a surprise.

	displaying	top
	copyBits:from:at:clippingBox:rule:fillColor: Make up a BitBlt table and copy the bits.
	deferUpdatesIn:while: DisplayScreen overrides with something more involved...
	drawLine:from:to:clippingBox:rule:fillColor: Draw line by copying the argument, sourceForm, starting at location beginPoint and ending at endPoint, clipped by the rectangle, clipRect. The rule and mask for copying are the arguments anInteger and aForm.