book, A Mandate for Playful Learning in Preschool,15 that advocated the value of play as a metaphor for the kind of active, engaged, and meaningful learning that occurs when a child masters counting by playing Chutes and Ladders and when he understands stories through the tales of King Arthur and his valiant knights. Our book celebrated the science of learning in action and concluded with what we called the 5Cs—a skill set for the 21st century designed in the lab for the living room. These included collaboration (or how children learn to work together and see from another’s point of view),
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