We mustn't be afraid of inventing anything...Everething there is in us exists in nature. After all, we're part of nature. If it resembles nature, that's fine. If it doesn't, what of it? When man wanted to invent something as useful as the human foot, he invented the wheel, which he used to transport himself and his burdens. The fact that the wheel doesn't have the slightest resemblance to the human foot is hardly a criticism of it.