Scenery is the effects that a person gives to a plaY for example costumes, background, lighting, sounds, and props.
scenery falls under the control of the set designer
Scenery is used to set the scene, mood and tone of a play. For example, a scene set in a garden may have a scenery involving trees and plants.
"Clare designs scenery for plays and productions" "The scenery was very detailed and so was greatly admired by the people watching the show" "The play was terrible - the scenery was better than the acting!" "I like being a passenger in a car rather than the driver, because it allows me to look at the scenery in more detail as we drive"
The set is the scenery: the depiction of the physical location of the play.
I believe it is called the backdrop.
the person who changes the scenery between scenes are called...