Styrofoam can be cut and shaped into lots and lots of shapes. you can carve it with sharp razor blades, electric carving knives, hot wire cutters, saws of various types and you can also use your fingers.
Home Depot sells Styrofoam building insulation is 2x8 sheets. I try to always have a couple of sheets around. They are just that handy. We use them for building models, adding spacers to the counterweight system and more.
Turn tables have been used in theater for a very long time. They allow for quick scene changes. They can be effective in adding movement to the show. On Broadway, a great example of turn table use is in the musical, Les Mis. They use the table to allow the actor to walk, but stay in one place.
The most interesting turn table I've worked on is the one built into the stage at Radio City Music Hall in New York. The turntable is built across three elevators. All three elevators must be at the same level.
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