A drop curtain is a type of stage curtain that is lowered or raised vertically to create or conceal a stage backdrop. Some synonyms for drop curtain include backcloth, backdrop, scrim, and cyclorama. A backcloth is a large painted or printed cloth or canvas used as a scenic background for a stage or theatrical production. A backdrop refers to a painted or printed panel hung behind or above a stage as part of the scenery. A scrim is a fabric that is opaque when lit from the front but transparent when backlit, used to create illusions of depth or to hide or reveal parts of the stage. Finally, a cyclorama is a large curved canvas or wall at the back of a stage that provides a continuous background for a scene.