To some people, darkness – mental as well as physical – is what seems to appear when life has no meaning. But through the philosophical approach of so-called existensial sensitivity, maybe we can actively withdraw to our darkness in order to transform from one psychological state to another. In a dialectic cosmology of light and darkness, we tend to associate light and cosmos where the dark is chaotic, however, darkness is needed for the world of light, the cosmos, to have a shape.