A top floor infinite pool plan typically refers to a design for a rooftop swimming pool that has a design element that gives the illusion of the pool extending to infinity. This is usually achieved through a series of visual tricks, such as reflecting the sky or the building's surroundings in the water's surface, or by integrating the pool with the landscape in such a way that it appears to continue beyond the building's edge. These designs often require careful planning to ensure safety, structural integrity, and compliance with local building codes.