We intend to clarify the perceived shapes of the street with setback space in the building lower part. Firstly, we made percentual experiments, using perspectives, and got 12 types of perceived shapes. Secondly, we showed subjects scale models using a visual simulator, and asked them to choose the perceived shapes from the types. Analyzing the results, we found that perceived shapes are related to the physical proportions of the street. Thirdly, we focused on the factors of the street such as frontage, depth, width, and height of building lower part, and got the relation between perceived shapes and these factors. Finally, using these 4 factors we made a diagram of distinction of these types. The diagram allows us to easily distinguish between perceived shapes.
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