Is there more to the question?
D: Circuit
A device that uses electricity to perform a task is called a(n) (electrical) circuit.
Answer:
In lighting for film, theatre and still photography, a cucoloris (occasionally also spelled cuculoris, kookaloris, cookaloris or cucalorus) is a device for casting shadows or silhouettes to produce patterned illumination. It is normally referred to as a cookie or sometimes as a kook or a coo-koo.
Explanation:
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