Children are intrigued by switches that power a light source and by items that reflect light and sparkle, and they take notice of personal shadows cast on the playground. Many fields in STEM draw upon understanding of light and shadow, such as astronomy, biology, engineering, architecture, and more. This second volume in the STEM for Our Youngest Learners Series shows teachers how to engage children (ages 3–8) with light and shadow in a playful way, building an early foundation for the later, more complex study of this phenomena and possibly piquing the curiosity of children that will ultimately lead to professions within the field of STEM. The text offers guidance for integrating literacy learning and investigations and for building partnerships with administrators. Each volume in this new series includes vignettes showing educators and children engaging in inquiry learning, guidance for selecting materials and arranging the learning environment, modifications and accommodations for diverse learners, establishing adult learning communities to support professional development, and more.