I have discovered that a screw-shaped device such as this, if it is well made from starched linen, will rise in the air if turned quickly.
Leonardo da VinciPeople reveal themselves completely only when they are thrown out of the customary conditions of their life.
Leonardo da VinciTo such an extent does nature delight and abound in variety that among her trees there is not one plant to be found which is exactly like another; and not only among the plants, but among the boughs, the leaves and the fruits, you will not find one which is exactly similar to another.
Leonardo da Vinci