an optical effect by which figures on a screen appear to dwindle into the distance or to rush towards the observer with enormous increase of size
a constantly shifting, confused succession of things seen or imagined, e.g. in a dreaming or feverish state
phantasmagoric /-ʹgorik/ adj
phantasmagorical /-ʹgorikl/ adj
[French fantasmagorie, from fantasme (see phantasm) + -agorie, prob from Greek ageirein to assemble, collect]