By exercising control of error when working with the apparatus, the child’s mind is held by the apparatus. If he replaces the cylinders incorrectly...

It is therefore best to start by giving him the set where the difference is in two dimensions. As all the cylinders in the set have the same height...

Just as in the case of the solid insets, the control of error over such exercises [geometry cabinet] is absolute. A particular figure cannot be put...

The phenomenon to be expected from the little child, when he is placed in an environment favourable to his spiritual growth, is this: that suddenly...

The light and easily moved tables, chairs, and armchairs permit a child to choose the most convenient position. He can make himself comfortable rather...

The phenomenon to be expected from the little child, when he is placed in an environment favourable to his spiritual growth, is this: that suddenly...

We must help the child to liberate himself from his defects without making him feel his weakness.

The child must see for himself what he can do, and it is important to give him not only the means of education but also to supply him with indicators...

The environment itself will teach the child, if every error he makes is manifest to him, without the intervention of a parent or teacher, who should...