Artists who have played with their own paredolia first, know how to play with the pareidolia of the beholders of their works.
Found today: Bycatch from my Snark hunt:
The big beast perhaps gave birth to a Boojum.
(John Tufail made me aware of this illustration by J. J. Grandville.)
The text is an excerpt from Henry Holiday’s The Snark’s Significance (1989).