There are only six hours in a school day, only another six or so till bedtime, and adults are forever trying to cram those hours with activities that are productive, educational and (almost as an afterthought) fun. Animal findings about how play influences brain growth suggest that playing, though it might look silly and purposeless, warrants a place in every child’s day. Not too overblown a place, not too sanctimonious a place, but a place that embraces all styles of play and that recognizes play as every bit as essential to healthful neurological development as test-taking drills, Spanish lessons or Suzuki violin.
Source: here