At the very least, we all know it is possible to break a kid's spirit by sticking them in a room for six to eight hours a day and telling them to learn but giving them nothing to learn. When they cope by daydreaming, call them out on it. When the work they turn is "too" creative, criticise it. When they voice new ideas, reach out to their neighbors, doodle, beg for actual learning, put a stop to it. I believe a term frequently used to describe this is maintaining discipline.