The Abacus and Cuisenaire Rods

For this contest, I decided to propose two timeless objects with which we all possessed as children.

The abacus and cuisenaire rods are simple objects, but they can be passed down from generation to generation and will never lose their function.

it is fascinating to think that we all started doing the first mathematical operations with this objects and that they were also used by the ancient Greeks or Egyptians.