In The Picture of Dorian Gray there is a clear relationship between art and life in that Dorian Gray himself, lured by Lord Henry Wooton, decided to experience "sensations" and to seek out for the ultimate representation of beauty in its most aesthetically sophisticated forms.
Art and Life are intertwined in that Dorian basically gave his soul in exchange for youth, and that all the evils of his life, sickness, disease, and age be all transferred to the painting made by his friend, the artist Basil Hayward.
There is also another element: Love and obsession. Basil was obviously sexually and psychologically infatuated by Dorian Gray. In his immense adoration, as Basil said himself, he "gave too much of himself into his art". Perhaps the fusion between love and magic were the elements that made the magic supernatural. Add to this Dorian's own hedonism combined with Lord Henry's luring into the essences of evil what made life imitate art while art was trying to imitate life.