Hour of the Ox [2am] (Ushi no koku), from the series

The Hour of the Ox — roughly 2:00 in the morning — corresponds in Yoshiwara life to the deep hours after a courtesan's patrons have retired, a liminal period of exhaustion and private solitude. Utamaro exploits this temporal frame to depict a woman at her most unguarded: perhaps extinguishing a lamp, rearranging her hair before a mirror, or simply resting. The late-night setting likely called for a darker tonal palette, with indigo or near-black grounds produced through multiple ink applications suggesting lamplight against darkness. Within the series format, the Ox hour provides maximum contrast to the busier daytime prints, and Utamaro's psychological acuity in rendering quiet interiority is particularly evident in compositions tied to these nocturnal hours.