Mathematics is the language of nature. By applying a grid – a mathematical structure – to nature, we translate context into objective environments with measurable properties such as dimensions, textures, and colors. The grid, nowhere more visible than Chicago, transforms nature into neutral, indisputable, and absolute facts. In contrast, willfulness is the agent of ambition that allows architects to tamper with nature. Willfulness is the courage to be irreverent to the grid, to transform facts into fictions, and to disturb absolutism with ill-advised logic. To be willful is to be human, and we must accept the artificial, subjective tendencies that render architecture decidedly man-made.