- The formal organization of space can be achieved by forth factor which included radial, linear, cluster and central. It is imperative to consider the physical framework and the 92 external space of a building. According table 4 radial and linear is more useful in to their buildings. For example in comparison to the first 3 buildings at the Table with TWA and Sydney Opera House, those are radial organization concept and the structural are dome but TWA and Sydney Opera House are shell structure and linear. The most of dome structure is radial and most of shell structure and pneumatic is linear.