I read somewhere that modeling clay has been recognized as the best development toy ever. My daughter Paula and I quite agree, but only if we think of marble as an exception.
Cutting sounds simple, but in practice it is important not to miss the sensitive development of this skill. Regularly stimulate your child in this occupation by means of different exercises.
A geometric figure is the best tool for developing the attention of a child. A child learns to distinguish simple forms earlier than more difficult objects, and figures are an abstract symbol which can be turned into anything.