Bev Bos coined this phrase: The child is the curriculum. That really defines child-centered teaching & learning. We learn so much about our children when we interact with them and let them choose what they want to do in the classroom. I like to define "curriculum" as 'everything that happens in the classroom'. "You can discover more about a person in an hour of play than in a year of conversation" - Plato from http://www.playcounts.com/