Answer:
Followspot.
Explanation:
This fixture is optically identical to an ellipsoidal spotlight but is rarely equipped with shutters. It can be zoomed from wide to narrow and usually has an iris, as well, which can further change the size of the beam.
It is used with an operator in real time to aim at and follow a performer on stage.
True, the ancient Byzantium were soon to be called the Ancient Romans when the Byzantine Empire fell.
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