Block 4 is the last one to be used from 30 months of age onwards because it introduces more complex work with elements of inversely proportional dimensions. It, facilitates freedom of choice and concentration, gross and fine motoric skills, eye-hand coordination, visual perception through the education of sight with reference to dimension (this block...
The material includes a wooden box with lid containing 19 solid wooden prisms with square section of 1 cm and length 20 cm. The box has UNI EN 71-3 finishing.