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I have been trying to connect the edges metaphor to other sensory perceptions. Since its all about difference, its easy to see how it applies. The things we "feel" are only the things we are made aware of. We are never tuned into how our entire body is feeling. Similarly, with taste and smell we are probably differentiating between the basics (sour, sweet, bitter) and filling in a lot of it.

Thinking about taste and smell added another layer to our conversation about filling in things we see. I started to think about how smell is the strongest taste tied to memory. A significant part of the "filling in" process must also have to do with memory. When I ate chocolate cake tonight, I was expecting it to taste a certain way. 

It got me thinking more about a quote I heard that we only ever see something once. The same thing must be true for our other sensory perceptions. The first piece of chocolate cake I ate has probably influenced every other piece of chocolate cake since. I am probably filling in more from memory than what I am actually tasting at that moment.