No, that's not a collage, it's just one single image
If you look at that photo above, any sane person would say it's an edit. That it's four images stitched together into a single frame. But what you're looking at is actually a single photograph, expertly and perfectly prepared to create the optical illusion of four photos edited together.
The image was made by photographer Bela Borsodi for VLP's album Terrain back in 2011. If that second image doesn't really make sense to you as to how the whole thing fits together, maybe this YouTube video of it being set up might.
[via This is Colossal]