I believe man will fly and I base this assumption on the fact that God has blessed us with minds that are capable of imagining it. Anything that can … - Leonardo da Vinci

Nature is full of infinite causes that have never occurred in experience.

Drawing is based upon perspective, which is nothing else than a thorough knowledge of the function of the eye. And this function simply consists in receiving in a pyramid the forms and colours of all the objects placed before it. I say in a pyramid, because there is no object so small that it will not be larger than the spot where these pyramids are received into the eye. Therefore, if you extend the lines from the edges of each body as they converge you will bring them to a single point, and necessarily the said lines must form a pyramid.

The image of the sun where it falls appears as a thing which covers the person who attempts to cover it.