What is a thunder sheet used for in theatre production?

A thunder sheet is a large metal sheet used in theatre production to create the sound of thunder. When struck or manipulated, it produces a resonating sound that mimics the rumble of thunder, effectively enhancing the auditory experience of a performance. This tool allows sound designers and directors to incorporate realistic sound effects into plays, especially during scenes that require atmospheric conditions like storms or dramatic tension.

The other options do not accurately describe the function of a thunder sheet. Stage lighting control involves different equipment and techniques, while a backdrop is typically a painted or printed fabric that sets the scene visually. Lastly, stage entrances are techniques or setups for actors to enter and exit the performance area, which is unrelated to the sound effects provided by a thunder sheet.