plaid screen: n. [XEROX PARC] A `special effect' that occurs
when certain kinds of memory smashes overwrite the control blocks
or image memory of a bit-mapped display. The term "salt and pepper"
may refer to a different pattern of similar origin. Though the term
as coined at PARC refers to the result of an error, some of the X
demos induce plaid-screen effects deliberately as a display hack.
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