Abstract
Mies van Her Rohe didn't talk much 'about his proportion system. For instance he wouldn't admit that he used the Golden Ratio. But as the result of the analysis of the plans of House with Three Courts and IIT Chapel which had the Golden Ratio, it became clear that the positions of main axes and partitions in these plans were decided by the proportion system of "Whirling Squares starting from a Golden Rectangle" and so on. That makes sure that Mies intentionally used the Golden Ratio as his proportion system.
