Young children learn best when they can explore, experiment, and engage–activities that comprise play. Yet play is often contrasted with work, which includes learning in school (we call it schoolwork!). Here we consider three complementary perspectives (evolutionary developmental psychology, Indigenous ethnography, and Montessori pedagogy) indicating that play, characterized by choice, movement, and active engagement, is the meaningful work of childhood. Drawing on evolutionary theory, we present evidence that children have evolved to learn most effectively through self-directed play, hands-on exploration, and social participation, not direct instruction. Ethnographic accounts from Indigenous communities worldwide illustrate how children learn through genuine participation in the real work of daily life, where the line between play and work is largely absent. We then examine Montessori education as a modern pedagogical model that closely reflects these ancestral learning conditions, centering child-directed activity, embodied learning, and purposeful engagement with real materials. By bridging evolutionary developmental psychology with cross-cultural perspectives on early childhood learning, this essay challenges educational models that separate play from productive learning and highlights how evolutionarily aligned environments support development and wellbeing.