How is learning organized in a Montessori classroom?

A Montessori classroom is usually a large, open space, with low shelves and a mix of individual and small group child size tables and chairs.  The classroom or environment, as it is often referred to, is arranged into areas by subject and divided by low shelving.  Every Montessori material has its place on the shelves, and children are expected to put each materials neatly back in its place after use, ready for another child.  Children are free to work where the choose - at tables, on the floor, or on small rugs.  They can choose to work alone or in self-formed groups, except she the teacher is giving a lesson.  Lessons are almost always given to individuals or small groups, as children are ready for them.