* For background information on RawViewer and Projector Calibration, see the step-by-step directions from the UC Davis project.
Below are photos after the water is mixed in. Charlie is seen working with a small disc during the projector calibration process. And because word spread quickly that the sandbox was near completion, we had our first class visit. Preschoolers came in to explore the sandbox, learn a little about topography, and receive an introduction to PIRL.