abstract idea
An idea you can't touch or see directly, such as hope, loss, home, belonging or fear.
aid
Something that supports a drama: audio (music, sound effects), visual (light, projection, props, costume) or technological (recording, video, apps).
cue
A signal for a change in lights, sound or projection at an exact moment.
cue sheet
A plan that lists each cue in order and when it happens.
projection
An image or video shown on a screen or wall behind or around the performers.
silhouette
A dark outline of a person or object against a light background.
symbolic
Standing for an idea, not just itself: a single empty chair can stand for someone who is missing.
criteria
The qualities you use to judge whether something works well.