Polaroid Pogo printers, she had done a double exposure! It is so simple, all you need to do is print one image, then run that print back through the printer and print a different image!
I played around with it last night with pictures of Catherine and Celeste, and pages they worked on at the retreat. There was a little too much dark in each of the images, so they aren't very clear, but you can get the idea! Traci also had a link to a very cool video which showed some truly awesome things to do with the prints from the Pogo. If you have been thinking about getting a Pogo, this ought to push you to do it!