My newest most favoritest word:

PHANTASMAGORIA
\fan-taz-muh-GOR-ee-uh\, noun:
1. Any constantly changing scene; usually made up of many elements
2. A fantastic sequence of haphazardly associative imagery, as seen in dreams or fever
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.
4. A shifting series of phantasms, illusions or deceptive appearances, as in a dream
5. Fantastic imagery as represented in art

[Alteration of obsolete French phantasmagorie, art of creating supernatural illusions : perhaps fantasme, illusionphantasm) + (from Old French; see allégorie, allegory, allegorical visual representation (from Old French, allegory, from Latin allēgoria; see allegory).]

1802, name of a "magic lantern" exhibition brought to London in 1802 by Philipstal, the name an alteration of Fr. phantasmagorie, said to have been coined 1801 by Fr. dramatist Louis-Sébastien Mercier, from Gk. phantasma "image" + second element probably a Fr. form of Gk. agora "assembly" (but this may have been chosen more for the dramatic sound than any literal sense). Transf. meaning "shifting scene of many elements" is attested from 1822.