Circle in Space—Space in Circle: A Study of Ratio between Open Space and Built-Up Area in Historical Circular Objects

Many cities nowadays explore different circular designs as new sustainable city concepts in urban aspects. The trend, part of the adaptation for climate change, is a strategy increasing number open spaces, and plan design could be approach to development. This paper provides historical overview various examples objects containing built structures spaces from Neolithic present. Built-Up Area (BUA) Open Space (OS) relationships are shown histogramically 36 arranged chronologically. morphospace analysis was performed determine any possible regularity parts objects. For purpose this research, three variables were chosen. First, all selected divided into two main categories: with total diameter smaller than 300 m bigger m. Additionally, by their type space better understand spatial position. largest analyzed belongs Parks–Gardens category, followed settlements, then earth works, sacral buildings, smallest being category allotments plazas. second variable Jam area % Jam. buildings sizes up several hundred m2, areas range ha. OS ratio ranges 0% (for Large Serdab) 100% multiple objects). There similar situation ratios (total “jam”). final position Circular belong periods aim research relationship between BUA diameters find out if there relationship. indicates that no clear built-up space, but aspects results here contribute sustainability since play key role future processes.