The lid is located close to Jigokudani Monkey Park, known for its macaque monkeys that bathe in the hot springs. The lid shows a monkey bathing in the water.
Photographer’s note: The location is the city of Shibu, which has many bathhouses (onsen) based on the area’s abundant natural hot springs. The region is also known for its nearby monkey park, located not far from the town. Therefore, the painting depicts a monkey soaking in a hot bath.
Translation of the text on the cover: お猿の温泉 - Monkey Hot Springs