Even though the author of Dorian Gray preached aestheticism as the ultimate goal of arts, his work does not converge to that conclusion.
Oscar Wilde, along with other artists belonging to the movement, claimed to believe art is done for art's sake. That, behind books, pictures and music, there shouldn't be a deeper meaning, a lesson to be taught and learned, any political positioning to defend or attack. Art was, thus, only supposed to be beautiful.
However, Wilde's character Dorian finds himself sinking in life for his lack of moral. Concerned only about his own youth and beauty, Dorian is incapable of loving and connecting to another human being. Consequently, everyone around him suffers and he becomes a dark and lonely soul, whose sins and real age are apparent in a picture of him painted by a friend.
All plants make their own food, have a cuticle, have a cell wall, and reproduce with spores and sex cells.
The correct answer is - The insane live in a reality of their own.
The narrator's reality isn't the same as the old man's reality - this is because the narrator is insane. However, he wasn't always insane - what drew him to madness is the old man's 'eye of a vulture.' He became fascinated with the eye, started hating it so much that he wanted to kill the old man, which he did. After that, his madness didn't go away - it just grew stronger until he admitted his crime.