When you take the next cube, emphasize the degree of exactness required in placing the cubes, otherwise the children will not repeat the exercise as...

From a logical point of view, you should first present the set with the cylinders that vary in three dimensions. However, we do not do so for...

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...

The aim of this apparatus is the same: to aid visual discrimination of size or dimensions. The sets of apparatus are coloured differently and...

The differences are exactly measured in the cylinders. The difference between the first and the second is similar to that between the second and the...

When you place the cubes precisely, you will find the hands begin to tremble, especially when placing the very smallest. There is little weight to...

If one sense is isolated, it seems to be enhanced in its power of perception. The possibility of perception is more profound. It is the concentration...

Holding the knob of the cylinders with the first two fingers and thumb is a preparation of the coordination of the hand for writing. At a later age...

Cylinders give an impression of shape. Bodies can differ in three dimensions. If two dimensions are alike in a series of objects, the dimension which...