Quiddity is the name of the dream sea, first mentioned in Clive Barker's novel, "The Great and Secret Show". The sea is part of what the book refers to as "the metacosm", a place that basically runs parallel to the world we know. Every being is said to enter Quiddity three times: at birth, at death, and when you first sleep with your true love. At the center of Quiddity lies an island called the Ephermis, the home of certain nightmarish creatures. While Quiddity is not a real sea and the Ephermis is not a real island it is said that man couldn't grasp the true definition.