"Pigt tribe member climbing ladder" animation progress by Florian Eichin
info@florianeichin.de
Prince Keef animation progress by Laurence Kit de Castro
laurencekit07@gmail.com
Above is the origin of the meme "What Has Been Seen Cannot Be Unseen" -the meme has now officially been stated as the origin of Dave Sim, the creator of Cerebus.
http://knowyourmeme.com/memes/what-has-been-seen-cannot-be-unseen
The quote from the above comic book page became the catch phrase of Cerebus fans, and independent comic book lovers alike at the comic book circuit and such, after it first appeared in issue 177 page 17 panel 6 in 1993.