Size, speed, weight, direction, distance: We think of space and time as fixed and measurable, but these measurements—our experience of space and time—are relative. Unpacking Albert Einstein's theory of relativity for readers 4 to 8, Julia Sooy follows the daily activities of a girl as she takes a train ride, goes on a picnic, watches fireworks, and falls asleep. Along the way Sooy notes the math that we use to map out our world, Moll Walsh emphasizes in her detailed, thought-provoking illustrations.