The Right One — Scott McCloud
The Right One by Scott McCloud is an interesting piece (and contains mildly nsfw cartoon images.) It’s particularly interesting to me because it’s primarily a story about categories, similarity, and ordering, and I highly recommend reading it. I thought it was astounding, and have played through the comic several times.
I’m not going to into detail about how, because that would kill the awesome, but if you read it, you should get a sense fairly easily.