The geoboard is one of the most beneficial materials in a Montessori classroom and at home. It is both a Practical Life activity and a Sensorial activity, depending on how you use it (present it to the child).
Practical Life
"All the practical life activities, in addition to improving hand-eye coordination and muscle control, are designed to increase the child's ability to concentrate [and to also go from left to right, and from top to bottom]." Montessori on a Limited Budget by Elvira Farrow and Carol Hill
Practical Life Introduction from my Montessori training manual: Keep reading post at my NEW blog!
