... human visual perception is undoubtedly an astonishing feat. The very fact that it has proven so hard to implement a mechanical visual system comparable to that which we possess bears witness to the scope of the problem. To construct a robot that can simply navigate its way around a novel environment without crashing into things is quite an achievement and yet we fail to see anything remarkable in our in-depth understanding of the visual information presented to us. Millions of times a day this information is modified and updated and yet it goes almost completely unnoticed that what we are taking for granted is in fact an extremely complex operation. But consider for a moment what processes are involved. Consider what processing must be going on which can tell us not only what it is that we are seeing but can also give us clues as to spatial relationships, size ...

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