The dog in Yoshitomo Nara’s “Do Not Disturb!” is a beguiling bookworm who has found a quiet spot to do some reading. An influential Japanese Pop artist who gained a cultish following in the 1990s, Nara is known for painting cartoonishly aggressive children influenced by Japanese comic books and American cartoons. His images, which express children’s alienation and intense independence, are featured on CD cases, ashtrays, clocks and T-shirts.