chimerical

Of or pertaining to a chimera.

Being a figment of the imagination; fantastic (in the archaic sense).

a chimerical goal

"Yes; I have a turn both for observation and for deduction. The theories which I have expressed there, and which appear to you to be so chimerical, are really extremely practical—so practical that I depend upon them for my bread and cheese."

Inherently fantastic; wildly fanciful.

"You are the most charming person in the world. You are invested with a perfect halo of delight," exclaimed Henrietta. "Miss Churchill has some chimerical notion of honour in her head, but that is over now; your information does not leave a single obstacle in the way of the most perfect happiness that ever wound up a fairy tale...

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.