It's probably not, though. Evolution doesn't select for perfection, and many aspects of our evolutionary derived bodies are frankly bizarre. Take the eye as an

It's probably not, though. Evolution doesn't select for perfection, and many aspects of our evolutionary derived bodies are frankly bizarre. Take the eye as an example. There's no need for us to have a blind spot. Octopus have eyes almost identical in design, but without a blind spot - convergent evolution meant that both species ended up developing very similar eyes but with one crucial difference: in humans, the retina is wired the wrong way round. The retina is like a huge array of light detecting cells. In octopus, these cells are connected to the optic nerve on the back side. In humans, they connect on the front side. The blind spot in humans is because of the need for a hole in the retina for the optic nerve to pass through and split and connect to the retina proper.