. . "Experiments." . . . . . "Discusses how shadows form, why they change shapes, and how studying shadows led to the invention of the camera. Includes directions for building a shadow box and performing overy fifty experiments."@en . . . . . . . . "Shadow play : making pictures with light and lenses"@en . "Shadow play : making pictures with light and lenses" . "Shadow play" . . . "Explores basic principles of light and discusses the invention of the camera." . "Juvenile works"@en . . "Juvenile works" . . . . . . . .