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Kukaloris Printable version

https://www.controlbooth.com/wiki/Kukaloris

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A panel with irregular holes cut in it, placed in front of a lighting instrument, so as to project patterned shadows onto a subject. Used more in film and video than theater, which relies primarily on gobos (which are inserted into the lighting instrument).

Also called a Cookie, and alternatively spelled as http://www.controlbooth.com/forums/glossary/8848-cukaloris.html.
Here's an article that shows a kukaloris in use .