Hand-drawn pool on the roof with no boundaries

Quick answer：

This refers to an artistic depiction of an infinity pool located on the rooftop, designed to give the illusion of extending indefinitely into the distance, often creating a stunning visual effect. Infinity pools are architectural features that incorporate a pool with one or more sides that extend to the ground level, allowing swimmers to feel as if they are floating without boundaries. They are often used in luxury homes, hotels, and resorts for aesthetic and functional reasons.