Montessori

Dr Maria Montessori founded Montessori Education in 1907. The Montessori approach encourages learning through all five senses and includes encourging children to learn at their own pace without too much interruption.

Montessori education is mostly led by the children and is a similar approach to natural learning / unschooling. 

For more information about the Montessori approach, you can visit:

http://www.montessori.edu/

http://www.montessorimaterials.org/

http://www.michaelolaf.net/