120 ft (30 ft cube*)
You create an illusion of an object, creature, or visible phenomenon within range that activates when a condition occurs. The trigger must be based on visual or audible conditions that occur within 30' of the area. The illusion is imperceptible until then. It must be no larger than a 30' cube. When cast, you decide how the illusion behaves. This scripted performance can last 5 min.
When the condition occurs, the illusion springs into existence and performs in the manner you described. Once the illusion finishes performing, it disappears and remains dormant for 10 min. After this time, the illusion can be activated again.
Physical interaction with the image reveals it to be an illusion, because things can pass through it. With a successful Investigation check against your spell save DC, a creature can discerns the illusion for what it is.
a bit of fleece and jade dust worth at least 25gp