Being a figment of the imagination; fantastic (in the archaic sense).
Resulting from the expression of two or more genes that originally coded for separate proteins.
Impossible to physically produce due to having an impossibly-high saturation or luminosity, but viewable by overlaying an afterimage and a suitably-colored physical image.
Of or pertaining to a chimera.
Inherently fantastic; wildly fanciful.
Like something from a dream; having a sense of vagueness, insubstantiality, or incongruousness.