Is there anything that represents the innocence and glory of childhood like sidewalk chalk? Watching the kids draw on the ground, and building, with chalk brought tears to my eyes. It was adorable. Then, they photographed the chalk and we got some very interesting shots. Especially since they already learned worm’s eye view, and got that yummy shallow depth of field.
With the older kids I showed several examples of how chalk can create a fun illusion that they can interact with. I made it very friendly, for all ages and abilities. They could draw something intricate or simply use color and shapes and photograph the chalk in compositionally interesting ways.