“The tattoo is a marker of life’s journey,” designer Ed Hardy writes in his memoir. Perhaps that is why tattoos hold a certain fascination even for those who don’t have them. The concept of choosing from an infinite variety of images to permanently affix to the body is compelling. Why do people choose the designs they do? Some unique books on the topic have recently arrived at the library. Ranging from an adult memoir and nonfiction to a children’s picture book, each offers a different window into the world of tattoo.