Cobain immersed himself in artistic projects throughout his life, as much so as he did in songwriting. The sentiments of his art work followed the same subjects of his lyrics, often expressed through a dark and macabre sense of humor. Noted were his fascination with physiology, his own rare medical conditions, and the human anatomy. According to Novoselic, "Kurt said that he never liked literal things. He liked cryptic things. He would cut out pictures of meat from grocery-store fliers, then paste these orchids on them ... And all this stuff on ["In Utero"] about the body – there was something about anatomy. He really liked that. You look at his art – there are these people, and they're all weird, like mutants. And dolls – creepy dolls." Often unable to afford artistic resources, Cobain improvised with materials, painting on board games and album sleeves, and painting with an array of substances, including his own bodily fluids. The artwork seen in his "Journals" later drew acclaim. Many of Cobain's paintings, collages, and sculptures appeared in the artwork of Nirvana's albums, such as the covers of "Incesticide" and "In Utero". His concepts featured in Nirvana's music videos, sometimes leading to arguments with the video producers.