In 2012 Disney unveiled their Glow With the Show hats, Mickey Mouse Ears that illuminate in sychronization with certain night-time shows at the Parks. Although I’ve yet to see it in person, the effect is really quite striking.
Here’s a ground-level view from the day it debuted at World of Color at a Disney’s California theme park.
The Verge explained the underlying tech.
The net result is that Disney’s canvas for their shows now extends far out into the audience space. Spectators now become willing participants. The sense of spectacle is dramatically heightened.