I am deeply appreciative of these examples. They’ve helped immensely. When I was studying stages of childhood, I realized I never believed in the abstract operational stage. I’m not sure many people pass out of the concrete operations stage. My first husband was a high energy physicist and he could tell you exactly what an atom looked like and what color the components were. He turned everything into an image in his mind. I find these examples to be the best learning devices for me, and really thank you for the conceptual aid.