In The Picture of Dorian Gray, explain the cause of Dorian's infatuation with Sibyl Vane.

In Chapter Four, when Dorian first reveals his love for
Sibyl, it is clear that what has driven this infatuation is Sibyl's art as an actress.
In a novel that is dominated so much by art in all of its various forms, and which sets
art off against reality, Sibyl as a character represents art in all of its passionate
excess. Note what Dorian says to Lord Henry about why he loves
her:

Harry, I
do love her. She is everything to me in life. Night after night I go to see her play.
One evening she is Rosalind, and the next evening she is Imogen. I have seen her die in
the gloom of an Italian tomb, sucking the poison from her lover's lips. I have watched
her wandering through the forests of Arden, disguised as a pretty boy in hose and
doublet and dainty cap. She has been mad, and has come into the presence of a guilty
king, and given him rue to wear, and bitter herbs to taste of. She has been innocent,
and the black hands of jealousy have crushed her reed-like throat. I have seen her in
every age and in every costume. Ordinary women never appear to one's
imagination.

We can thus see
that what draws Dorian to Sibyl is her character-changing properties and her skill as an
actor. Through these factors, she is able to appeal to his imagination and is a mystery
to him. Of course, ironically, it is when she loses her artistic skill because of her
love for him, exchanging reality for art that he is revolted by
her.