The photography collection "Hip!" by Japanese photographer Yoji Ishikawa is known for its focus on the theme of buttocks, along with other fetishistic elements, and the portrayal of women from behind. Ishikawa, who has been active since the 1960s, has worked on various photography projects including nudes, portraits of beautiful girls, and women-focused collections. Published in 1993, "Hip!" is one of his works released by Fuuga Shobo, a publishing house known for titles such as "Strippers Directory" by Yoshii Hara and photography books by Nobuyoshi Araki. In "Hip!", Ishikawa captures women's buttocks from various angles, employing different techniques and settings. His approach often features soft-focus reminiscent of David Hamilton's style, with careful attention to shadow, tone, and color, resulting in conceptual nude artworks that avoid monotony. While the theme of buttocks may evoke associations with the refined aesthetics of French master Jeanloup Sieff's "derrieres," as seen in fashion magazines like Harper's Bazaar and Vogue during the 1960s, Ishikawa's work presents a distinctly Japanese interpretation of sensuality, diverging from such sophistication.