Katsushika Ōi: The Hidden Hand Behind Hokusai’s Daughter Katsushika Ōi (c. 1800 – c. 1866), also known as Ei, was a Japanese Ukiyo-e artist whose legacy remains shrouded in mystery—a testament to the challenges faced by women artists during Edo period Japan. While overshadowed by her father’s monumental fame, Ōi possessed undeniable talent and contributed significantly to the artistic landscape of her time, prompting ongoing debate ab…