The light and his necessity.
You have wondered never why the person does see? Why do the 90% at least, the types that exist in the planet, need the sight? It possible is does exist a world without light? With a proportion? How many important is the sight? What becomes when the sight it is combined with the imagination? Exist however do types that are given birth blindly, how many they can develop these? Astonishing the isn't development of human community? The blinds in the organised states - societies, can have a physiologic life. Of course one from geniti's blind should have developed other faculties. Do these him give the same autonomy? Sure one blind beat out in a world without light, what you become however in the world with light? What we want to say, they are, it can't exist a other sight? The RADAR is a different sight for example.