In the early 60s in a town with esteemed faculty in prestigious institutions, there were also an abundance of artists (both freespirited and the more commercial variety) and lofty, private, and very expensive institutions offering art classes for the well heeled children of rich people, so collage for a time became the rage in my house at least. People could (and did) criticize such a form, pointing out this was mere assemblage of individual images already created by other artists (photographers usually as these images were clipped from magazines). Frank enjoyed the notion of collage because you could be so creative with it, assembling figures that held a separate distinct meaning into a grouping with a different intent and so a different effect on the viewer.
Frank also liked the joke I made up at the time: "I guess I'll go to collage and study Arp."
Because, as I said, we made fun of everything.
(I have copywritten that joke and the original resides in the Library of Congress. If you use it, you have to pay me $10 for each use. )