I wrote this so long ago. So, I might be contradicting what I said in the original post. :)Of course, I don't actually think I'm an angel or a pegasus just because I can imagine myself as one on rare occasions. ^_^If i begin to think that I am ____then I am ____?
It's kind of just that images and mythological figures like that seem to embody certain qualities. And, if I can imagine and identify with those figures, then I can actually become what they represent.
(Correct me if I'm wrong on this next section. I don't know shit about Buddhism.) Like, I'm under the impression that in Vajrayana Buddhism, a lot of the practices involve visualizing buddhas. The end result that one aims for in doing this is to become a Buddha by having a very clear image of the Buddha. The idea seems to be that identities are very fluid, and we become our thoughts/imaginations. So, if you meditate/pray a lot, certain patterns of thinking start to get ingrained into how you see things, and you become more like the Buddha.
The most interesting thing for me is that there are some figures that I literally CAN'T identify with. For example, I have a strong aversion to Jerry Lee Lewis, to the point that I can't even imagine being him. I think it reflects a limitation of my personality--you'll never see me acting like him.
So, I think the more fluid/flexible/active a person's imagination is, the more expansive/flexible their personality/self is. And that if you can imagine yourself a certain way, then you sort of are that thing that you imagine...or you're able to become it.