While human ingenuity may devise various inventions to the same ends, it will never devise anything more beautiful, nor more simple, nor more to the … - Leonardo da Vinci

Human subtlety will never devise an invention more beautiful, more simple or more direct than does nature because in her inventions nothing is lacking, and nothing is superfluous.

Human subtlety will never devise an invention more beautiful, more simple or more direct than does Nature, because in her inventions nothing is lacking, and nothing is superfluous.

Human subtlety...will never devise an invention more beautiful, more simple or more direct than does nature, because in her inventions nothing is lacking, and nothing is superfluous.

The spirit has no voice, because where there is a voice there is a body, and where there is a body space is occupied, and this prevents the eye from seeing what is placed behind that space; hence the surrounding air is filled by the body, that is by its image.

Verrà il tempo in cui l’uomo non dovrà più uccidere per mangiare, ed anche l’uccisione di un solo animale sarà considerato un grave delitto

In order to prove whether the spirit can speak or not, it is necessary in the first place to define what a voice is and how it is generated.