The props on the stage of our town must be imagined by the audience switched between each act replaced at the end of each act reconstructed for each performance

Imagined by the audience. 

In the play "Our Town," the actors mime using the various props, such as shucking the beans, sipping from milkshakes, and walking a horse. The audience does not see these props or items onstage so they must imagine them during the course of the play. 

include an element of surprise

Explanation: