According to ancient philosophy, the soul of the world, or anima mundi, indicates the vitality of nature and the idea that every organism on the planet is intrinsically connected, and therefore linked to the other by a great, common universal soul. An expression of paganism and animism, anima mundi was also reinterpreted according to Christianity in the Middle Ages. In the West, the first to deal with the anima mundi was Plato, in his book “Timaeus”, in which he dwelt on the concept of the universal soul.