Although we don’t often think about it, each of us inhabits two realities. One is the physical world, the other is our personal reality. Once you state this apparently simple fact, mysteries immediately arise. If two cameras photograph a tree, star, the sky or a cloud, the photos will be exact duplicates (assuming that the two cameras are set identically), but if two people gaze at a tree, a trained botanist will see something very different from somebody lost n the woods. If you are distracted, you might not notice the tree at all, since looking is a voluntary act, not an automatic one.