then rewind it back into the canister and begin shooting the roll again, this time with a different subject matter. so, for example, i might go outside and shoot a roll of nature shots, then rewind the canister, put it back in the camera, and shoot a roll of studio self-portraits on top of it. this creates multiple-exposure images inside the camera, which may or may not line up with each other, depending on how the film loads the second time around. sometimes days, weeks, or months go by between shooting each layer of images. all of these factors create images that appear completely random, but in fact, have a 