Obsessive (adj): thinking about someone or something too much or in a way that is not normal (www.meriam-webster.com)
Yayoi Kusama (1929 – present), a Japanese artist in her 80s, identifies herself as an “obsessive artist.” Having suffered nervous disorders and hallucinations as a child, she derives her artistic vision from them. Her fascinations include repeating patterns of dots, lines and other figurative elements such as eyes, profile of faces. Kusama asserts that repetition helps her ease her anxieties.
I make them [dots] and make them and then keep on making them, until I bury myself in the process. I call this process “obliteration.”