The Oval Dome New Thinking is a distinctive residential structure completed in 1981 in Himekidaira, Nagano Prefecture. Designed by Hiroshi Kosuda, Yoji Yamasaki of Damdan Spatial Workshop, and Osamu Ishiyama, this experimental dwelling showcases innovative architectural thinking of the early 1980s. Its striking egg-shaped dome form represents a bold departure from conventional residential design, creating a unique sculptural presence within the natural landscape. The building exemplifies the architects' commitment to exploring alternative spatial configurations and sustainable living concepts, making it a significant example of experimental Japanese architecture from this period.