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In this activity, students become familiar with the orientation of shadows, their size in relation to the object casting them, and how the alignment of the Sun, the object, and the shadow tells us much about how shadows work. Supplies needed for this investigation include pebbles, coins, marbles or counting blocks, a box of chalk, chalk/wipeboard and markers, overhead projector or lamp. This is lesson 4 of Threads of Inquiry: Observing the World Around Us, a series of 10 inquiry investigations focusing on the changing seasons and other aspects of our everyday existence. Each lesson includes teacher background information, Inquiry investigations are adapted to meet the developmental stage and skill level of students in three grade bands: K-2, 2-4, and 4-6. Each grade band is supported by educational strategies appropriate to the student's developmental stage, a narrative that models and describes the inquiry process applied in the lesson, and a hands-on inquiry investigation. Literacy extensions and a non-linguistic pre- and post-assessment accompany each lesson.