A device used in theaters and film to cast shadows or patterns of light on a stage or screen, creating decorative effects.
From French 'coquille' (shell) combined with 'loris' (possibly from a proper name or local term). The device was developed in 19th-century theater for creating artistic light patterns.
Theater technicians still use updated versions of cokuloris today, but the name is so old and specific that most modern lighting designers have no idea what it's called—they just call it a 'gobo' instead!
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