Louise Spilsbury & Richard Spilsbury 
Shadows [PDF ebook] 

This book looks at how shadows are created. – Test which materials block light (are opaque), let some light through (are translucent) and let most light through (are transparent). – Look at how you can make animal shadows using your hands! – You can make a sundial to explore how shadows can change depending on the position of the Sun. And much more!