>Aconfused group of real or imagined images that change quickly, one following the other as in a dream
>A sequence of real or imaginary images like that seen in a dream
>changing successions or combinations of fantastic, bizarre or imagined imagery
>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.
Example
>What happened next was a phantasmagoria of horror and mystery
>He saw a phantasmagoria of shadowy creatures through the fog
>In short, dreaming is synonymous to us with illusion, phantasmagoria, and falsehood.