English summary: In Proportions and Cognition in Architecture and Urban Design, practicing architects, historians, and theoreticians discuss the proportional systems that juxtapose aesthetic judgements, forms of practice, and human and social bodies with the norms and ideals that have resulted from these relationships. They retrace the history of these proportional systems, the expectations with which they were associated, how they were introduced into design, and how contemporary practice builds upon this tradition-or allows new interpretations to unfold. German description: In Proportions and Cognition in Architecture and Urban Design, practicing architects, historians, and theoreticians discuss the proportional systems that juxtapose aesthetic judgements, forms of practice, and human and social bodies with the norms and ideals that have resulted from these relationships. They retrace the history of these proportional systems, the expectations with which they were associated, how they were introduced into design, and how contemporary practice builds upon this tradition-or allows new interpretations to unfold.