Sky platform with boundaryless swimming pool in real life

Quick answer：

Boundaryless swimming pools, also known as infinity pools, are designed to create the illusion that the water extends to the horizon. They are typically located on the edge of a building, such as a skyscraper or a hotel, and are a popular feature in luxury residential and hospitality projects. The concept is based on the idea of blurring the line between the building and its surroundings, offering an unobstructed view and a sense of continuity with nature.