Step One: Draw a picture on half a peice of paper. Try to fill the whole space, and leave lines open in the middle, because someone will be connecting on to your picture.
Step Two: Fold the paper so that the open end of the image is revealed. Then hand it to someone to draw on the other half, don’t let them see your side, and let them know to connect their image to the revealed strip.
Final Step: After the other person has finished the drawing, open up the paper to reveal the final image!