The opportunity for the child to engage deeply with the work that is calling to them at that moment. All work needs to be accomplished by the end of the week, but they get to choose the order they work on them during work block. Also, work block is long enough for a child to actually get into deep work and make real progress. "Our whole family, (including the children) came for a visit. We had an opportunity to experience the culture of the school, and talk to some of the teachers and staff. It was a unanimous family decision that this school was our best option. The school aligns with our family's educational goals: deep work, development of concentration, ability to choose, fun, and outdoor enjoyment. Come for a tour. Be observant about how the classrooms run and how the children engage with each other, the materials, and with the teachers.