It's no secret that we are avidly interested in just about all things photographic. What is perhaps less known is our interest in the evolution of vision (and the perception of colour) in humans and animals. Rest assured, it is an area of study that is utterly fascinating, and we would urge you to look into it.
While we're on the topic of vision and evolution, we recently learned of an amazing species of deep-sea fish, called the macropinna microstoma (or "barrelfish"). It has eyes that are set within its head, and are covered by a clear memrane which forms a dome-like shape. The eyes can either point straight ahead, or can swivel upwards (about 90 degrees) to point directly above its head. This ability allows it to scan for prey swimming or floating above.
Scientists first became aware of barrelfish's existence in the 1930s, but it is only recently that a living example, with its delicate vision system intact, has been caught.
Please have a look at this footage: http://www.youtube.com/watch?v=Zoygy-8PTtU
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