"Multiplicity" Masking Excercise

By taking several photos on a tripod (or holding very still) have your subject move about the frame. Then layer the images on top of eachother and creating masks, paint the subject in, in different spots. *Note: to make sure this works properly, don't let the subject overlap from spot to spot.

1.) Layer images. Highlight all layers. EDIT > AUTO ALIGN LAYERS
2. Starting on the top layer, make a mask. Invert mask, then paint in with white where the figure was on that layer. Continue down the stack of layers. Should look like this: