Blue and yellow

The two colors are friendly. So much so that it becomes difficult to distinguish them from each other - they mix!

Once Leo Lionni was traveling with his grandsons Pippo and Annie on a train. So that the children do not jump on the heads of passengers, it was necessary to urgently come up with something. He found a blue-yellow-green page in a magazine and tore it into small circles. And in an important voice he began: “This is blue. And this is yellow…”