[XEROX PARC] A `special effect' that occurs when certain kinds of
{memory smash}es 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}.
[glossary]