Shell (theater)
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In theater, a shell is a surface designed to reflect sound. Often it is removable, rolling away on wheels or flying into a flyspace. Shells are commonly used for orchestras, bands, and choirs. They are usually decorative in nature as the audience must see them.
[edit] Construction
Shells are generally made of hard materials, unlike other acoustic treatments because they are designed to absorb as little sound as possible. Common materials are plastic or fiber board. Usually a metal frame is used to hold the reflective surfaces in place.