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Proscenium theatre is a
theatre space whose primary feature is a large
archway (the
proscenium arch) at or near the front of the
stage, through which the audience views the
play. The audience directly faces the stage, which is typically raised several feet above front row audience level. The main stage is the space behind the proscenium arch, often marked by a
curtain which can be lowered or drawn closed. The space in front of the curtain is called the "
apron". The areas obscured by the proscenium arch and any curtains serving the same purpose (often called
legs or
tormentors) are called the
wings. Any space not viewable to the audiences is collectively referred to as
offstage. Proscenium stages range in size from small enclosures to several
stories tall.