As all of you, I like to think about why and how Things happen; and as all of you I often feel frustrated by just how basic are the things we really don't know. What would help me at least a bit is a meaningful list of things, values, concepts that are relative (in physics), and another comparable set of concepts that are not relative. For example: Relative: time flow ("forward"?), space (distance, size), movement in space (?) Not relative: speed of light, Planck constant, quantities (number of stars, particles...) I would like the lists to be as accurate as possible, but the more general items on them, the better. I am really after some generalizations. Can you please help me add things to the lists? Can the things I wrote be questioned? Please do not get too specific, like listing different particles; and also please do not go outside of physics into things like emotions or psychological concepts (although they cen obviously be relative as well). Thoughts, anyone?