Jerome Bruner's idea of the spiral curriculum that's where it comes from there's an authentic version of any concept that can be taught to any child who can read and write you pitch it to the appropriate level of development and you keep coming back to it spiralling upward and upward and upward until that magic hand off moment which I think often happens and should happen in the upper grades of high school if it doesn't happen till college it's still not too late it's part of the great jolt I got when I got to college 