Every now and then I go through the collage channel and tag certain pieces as “misplaced” along with the comment, “This is not a collage.” Pieces like compilations of celebrity photos, style or fashion boards and sketch dumps. This is not a value judgement, only an observation that these do not belong in the collage channel. A couple of times I sent a comment directly to the submitter asking why he or or she thinks the piece is a collage or asking what specific element is collaged on the piece. The replies include, “I didn’t know where else to put it.” to “It was a mistake. It should have been in . . . “
However, once I got a more detailed response that ended with, “Feel free to disagree.” So I accepted the invitation. This is a slightly edited version of how I tried to explain why a sketch dump is not a collage.
Yes, a collage is "many different things making a whole." To be accurate, the word "whole" has to mean more than just all the images are on the same page. Putting a bunch of images on the same page does not automatically make something a collage.
To be a collage the whole has to be greater than the sum of the parts. There has to be a unified whole. In a sketch dump or other kinds of compilations (fan art, style boards, etc.), you look at one image, then you look at another, and so on. The parts remain parts.
In collage, as in any art work, composition is important. In a sketch dump, as far as I can tell, there is no intentional composition. The goal of a sketch dump seems to be to put as many sketches as will fit onto one page. There is no focal point. Little variety. Little contrast. No consideration of placement. No taking advantage of being able to juxtapose images to create impact.
The word collage comes from the French for "to glue." If there is not at least one element glued or fixed in some way onto the surface, then it's not a collage. Digital collages use layers to achieve the same thing. However, if you cut out each of your sketches and glued them back onto one sheet of paper, it would still need some unifying principle at work to help it become a collage rather than just a collection of images.