Re: Random simple questions
3rd - That would be a color scroller. Modern unites are DMX controlled and made up of two spools, one on each side of the opening. On the spools is a string of gel that is made by taping several pieces, or frames, together. There are motors inside that spin the spools to move the gel string back and forth. Google color scroller for more information.
Gobo's can be rotated by a gobo rotator.
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