Age 2 ½ to 4
Materials: 10 solid wooden cubes
The pink tower varies from  0.7x0.7x0.7 centimeters to 7x7x7 centimeters

Purpose: Build blocks of graduated 3 dimensional sizes in order to understand sequence and order.

Develops -
1.Visual and small muscular perception of dimensions.
2. This awareness of dimensions leads to observation of the child’s environment.
3. Helps to make smoother and more coordinated movement.
4. Math readiness by introducing concepts of smaller, larger, prepares for the decimal and number system.
This helps to prepare for the cube root. 1000 smallest cubes make the largest 10th cube. 8 of the smallest cubes make the second cube, 27 of the smallest cube make the third cube, 64 of the smallest cubes make the fourth cube, 124 cubes make the fifth cube, and so on.
The cubes represent the concrete concept of the numbers of 0.7 through 7
Error control. If the tower is incorrectly built, it will topple over. 
Hint: If the tower is too difficult give the child every other cube until he or she has mastered the exercise. Then add all ten cubes.