Recently I’ve reported how impressed and puzzled I am with a high level of mirror symmetry in the drawings of my grandson, age four. There I’ve stated that the mirror symmetry of my grandson’s drawings is a construct of his mind, not a reflection of his environment. And a forecast that other symmetries are to be "discovered" soon.

Well, it happened really soon, after only two weeks - take a look at the photo on the right. Suddenly, my grandson replaced the drawing paper with the larger stones collected on the beach, washed and smoothed by the waves. A dozen of his drawings on the stone are very good, starting with a well selected color of the pen used for a particular stone. But one on the right is especial - it announces, very clearly, central symmetry.