cyclorama

noun3

1. •
   A panoramic image displayed on the inside of a cylindrical canvas.

   • Robert Loo sat, quite content, behind the counter, against a cyclorama of tins of milk and corned beef. — 1959
2. •
   A large, often concave, backdrop, hung upstage in a theater.
3. •
   A building or room designed to show this image.