Junya Ishigami believes there are many differences between conventional architecture, as an artificial environment, and the natural environment - different forms and systems, different degrees of diversity, and different time. Yet the most fundamental difference of them all is scale, from subatomic particles, insects and animals, and the human world, to the global scale and even the incomprehensible vastness beyond our planet. In this book, Ishigami poses questions about how to bring this entire spectrum of scales into the realm of architecture, expanding its concept to embrace fluctuation and vagueness through five themes: Clouds, Forest, Horizon, Sky, Rain.