One prop needs to fit inside a jacket pocket. Another must have a speaker built into it. A third lights up. Props are, of course, central to scenic design. And the right prop may help an actor find his character. A good prop person has to work with, well, everyone.
Theatres compete for inventive prop people. They find them, well, everywhere. Jim Guy, propmaster of the Milwaukee Rep, says some have been costume crafts people, tech directors, scenic carpenters, scenic artists, or scene