These images are merely intended to be reasonable artist renderings based on available evidence, understanding that evidence regarding skin color, hair, and other characteristics are limited. - The Richard Dawkins Foundation for Reason and Science
The universe is a wondrous place. The first point is catchy, but not strictly correct. Complex atoms that constitute part of your substance had to be created in late-stage stellar collapse, sometimes in stars several generations old.
The simplicity of this loose parts activity is appealing to me. The child-sized rocks makes for straightforward play. Painting with water has the potential to encourage exploration of the properties of water.