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It actually isn't that weird, I've seen similar behaviour when I was studying CG at my uni. But I can't remember what the explanation was  . |
I don't know nothing about it, but it is simple.
The more polygons, the more difficult it is to see each individual difference of the polygon, as they are becoming more tiny every time.
So it's not the low polygon that looks so much different to the middle polygon version, that is about the right amount the eye can spot the real difference correctly.
But it is the high polygon that doesn't differ too much from the middle polygon version, because your eye can't spot the real difference anymore, it becomes a bit of a blur, thus it looks much more like a lower polygon model. If a hawk would look at it, it would clearly see the real the differences, as it has much better eye sight.
Lets say at the high polygon model your eye sees a spot of 10 polygons as 1 melted together. Thus about the same as a model that contains 10 times less polygons.
