hypersigil n. a creative work that via the medium of its artificial universe changes its creator, its observers, the real world, or other things. Etymological Note: hyper ‘over, beyond, or above’ ‘+ sigil ‘a seal or sign claimed to have occult or...
parergon n. a secondary, derivative, unnecessary, or supplemental occupation, ornament, or (creative) work. Also adj., attrib. Editorial Note: Plural parerga. (source: Double-Tongued Dictionary)