What is different about a Montessori Classroom?

In a Montessori classroom, children choose their own activities, and hence remain interested and engaged in what they are doing. A Montessori teacher is always close at hand, observing, and preparing to help with the next lesson or question. A Montessori class is also very clean and tidy. Children treat their materials with care and are required to put them in their proper place once they have completed their work.