A friend sent me some photos taken on a mountain hike. They seemed to derive from the following rules:
1. Carry a small camera in a big bag.
2. Always take a picture of a flower.
3. Change clothes from one picture to the next. (For example, wear pants in one picture and shorts in another picture, or a blue shirt in one picture and a white shirt in another picture.)
4. Make a funny face (for example, press finger into cheek).
5. Wear a funny shirt.