Montessori and Froebel stand in agreement also on the need for training of the senses; but Montessori's scheme for this training is at once more elaborate and more direct than Froebel's. She has devised out of Séguin's apparatus a comprehensive and scientific scheme for formal gymnastic of the senses; Froebel originated a series of objects designed for a much broader and more creative use by the children, but by no means so closely adapted to the training of sensory discrimination. The Montessori material carries out the fundamental principle of Pestalozzi, which he tried in vain to embody in a successful system of his own: it "develops piece by piece the pupil's mental capacities" by training separately, through repeated exercises, his several senses and his ability to distinguish, compare, and handle typical objects.