“In this striking scene a man reaches out from the interior background to draw the woman inside with him.”
The viewer is also brought into the act as they spy not only upon the encounter between the man and the woman, but also upon several more women in a third room that opens to the right, while the sense of public space is expanded even further to the outside world through the window on the left, where a harbor is visible. Multiple layers of space interact simultaneously each impinging upon the next with an ever-decreasing degree of privacy.
Reference: p.82 (Fig.25b) in Shunga, Stages of Desire published by the Honolulu Museum of Art.
Antique Japanese color woodblock. Shunga (Erotic print).