Visual Illusion in ARTPOP and Pop Art, by Professor Akiyoshi Kitaoka
Professor Akiyoshi Kitaoka, who designed the visual illusions used for the ARTPOP album cover, has published a paper about the inclusion of his work in the design by Jeff Koons. You can read the paper online!
Kitaoka, A. (2014). Visual illusion in ARTPOP and pop art. Japanese Journal of Psychonomic Science, 32(2), 232-234. [PDF file]