This book gathers 16 theorists from diverse spaces to see what they each have to say about play. From deep in the 19th century until contemporary times, across cultures and different disciplines, through many languages, these theorists observed children in their finest form, at play. From social interactions to meaningful engagements, beginning in the crib, and outside to the pitch and forest, these theorists examined the evidence before them. Each in their own way, they affirmed that play is at the center of childhood growth and development.