The implications of seeing exceed biology, and can take us into the philosophical, as has been insisted by various philosophers. Perhaps this is reflective of a basic instability in vision. We see, but there is always the chance of seeing differently. And we can deal with this risk in a variety of ways. On the one hand, we can deal with the risk of having the wrong image by denying the validity of all others – this is absolutism. One the other hand, we can claim that any image is as good as any other, and that all images tell us something about the world.