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## Viewports

- `((draw-viewport viewport) color)`
  Takes a viewport descriptor. It returns a function that colors the entire contents of viewport. The optional color argument defaults to black.
- `((clear-viewport viewport))`
  Takes a viewport descriptor. It returns a function that whitens the entire contents of viewport.
- `((flip-viewport viewport))`
  Takes a viewport descriptor. It returns a function that flips the contents of viewport.
- `(copy-viewport source-viewport destination-viewport)`
  Takes two viewport descriptors. It copies the source-viewport into the destination-viewport.