I think your mind makes new, different people, however, it bases the people off of what it thinks people should look like. For instance, if someone has only ever seen really tall white males, and no one else for their entire life (yes, impossible, I know), then their DCs would all be really tall white males. Then say, for instance, they read some book; their mind can then create characters and things from that book based on what it thinks they should look like; if a character’s height or skin color is never specified, then the person would make the DC based off of that character tall and white. With normal people, however, we’ve seen (or read) a lot more; we have people of all sizes, colors, hair colors, eye colors, facial shapes, and other stuff that we’ve seen, so we can create a lot more diverse DC’s…Does this make any sense? Am I just rambling now? Oh well, make of the post what you may, I think that’s how the mind works in this regard.