I've been working with collages quite a lot the last couple of years, mostly for educational illustrations and covers. This is the largest one I did, for the interior of a Life Orientation book, the concept was to have 4 illustrations that could fit into one greater whole.
So this is in fact the entire piece, if you chop it up into quarters each would have been a separate entity in the printed book (though the bottom pieces were rotated to look "upright") .
The subject lends itself very well to the medium and I was able to quite literally throw the kitchen sink in there!