The case is 99 square meters, and the resident members are husband and wife, and their son. With an aesthetic and design background, the couple yearn for the extremely austere of simple style and the original feeling of natural and simple cave dwelling, and love the warm and gentle sunlight at sunrise and sunset. This case applies the characteristics of the original space through the presentation of line proportions, greatly increasing the visual fluency, connecting the overall moving line, while maintaining a rich sense of hierarchy under the harmonious color and light source.