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For my avatar I chose an image that shows the surface of water.  I went back and forth about putting a picture of me, but because I was unsure about the level of anonimity I want to maintain on serendip, I decided that I could always do that later.  I chose this image because when you are looking down at a surface of water, you can see a general picture of what's beneathe, but it's not completely clear.  This is sort of how I see my presence on serendip at the moment.  I am trying to put myself "out there" (online, where anyone can see), while still trying to maintain a boundary (I'm just not quite sure what that boundary is yet).  My view my username "sarah" similarly.  Everyone (or at least most people) in our class know who I am when I post, but if a random person were to go on serendip, the name "sarah" isn't very informative because it's so popular.  Both my username and avatar allow me to express myself, while still maintaining some sense of privacy.