1.a shifting series of phantasms, illusions, or deceptive appearances, as in a dream or as created by the imagination.
2.a changing scene made up of many elements.
3.an optical illusion produced by a magic lantern or the like in which figures increase or diminish in size, pass into each other, dissolve, etc.
A fantastic sequence of haphazardly associative imagery, as seen in dreams or fever.
A constantly changing scene composed of numerous elements.
Fantastic imagery as represented in art.
It appeared to the audience as if the magician was really slicing his not-so-lovely assistant in half, but in reality he was only relying on the phantasmagoria of his smoke and light stage effects to give such an impression.
I'm sure there's a stronger way to use that.