Interior Space and Exhibition Design Xpower Gym Fitness Space by Fei Fang X-power Gym is a fitness space in Kunming that covers 520 square meters. The interior is based on the letter X, which is broken apart and reinterpreted rather than copied directly. Walls are formed by angled broken lines and rectangles, and the ceiling is composed of quadrilateral shapes that extend downward. Gray is the main tone, and only three design elements are used: rectangles, broken lines and linear light. Natural light enters through vertical openings by day, while line and surface light sources are hidden in the gaps at night.