This environmental unit is one of a series designed for integration within an existing curriculum. The units are self-contained and require minimal teacher preparation. The philosophy behind the units is based on an experience-oriented process that encourages self-paced independent work. This unit on shadows is designed for all elementary levels, grades 1-8. The activities become progressively more sophisticated, making some more suitable at different levels. In the first section, the goal is for students to explore the concept of spatial relationships through play activities with shadows. The games include shadow tag and keep away, shadow plays, and mystery shadows. The activities of the second section are concerned with shadows caused by sun and earth movements, and with the effects of shade on the life of plants and animals. Activities include studying the passage of time as indicated by shadows, determining the height of a pole by shadow calculations, and investigating the effects of shade on green plants. Each activity in the unit includes a list of materials needed, directions, and questions for discussion. (MA)