Your favorite color doesn’t exist. I’m sure you’re going to argue with that. But what I mean is that your favorite color doesn’t exist in a pot of paint. In some cases, a pot of paint in a particular shade of red may have the exact right effect you’re looking for. But next time, or on the next door, it may not work. Colors do not exist as single entities. The human eye only perceives color differences, not single colors. So the shade of orange that you like so much may only ‘happen’ when viewed against a white backdrop. Viewed against black or green or blue it may disappoint.