In buildings, light is a primary element which constitutes space. As light has a strong relationship with architectural design, the act of design is that of creating a space by light. When designers design buildings, they create habitable environmental ambience by focusing on various treatments of light. However, the interpretations of light depend on designers, so the method for expressing the interpreted light in architectural space and the resulting influence given to it varies. In this research, the objective is to reveal how architects see light in their design processes, and embody it in buildings through analyzing their text descriptions.

 The flow of this research is as follows

 1. Subject of this research is 849 samples from the text descriptions where architects refer to architectural spaces with their interpretation of “Light” in architectural magazine, Shin-Kenchiku during 1950-2011.

 2. Extract the sentences that contain 5 kinds of key-elements: Type of “Light”, Disposition, Design, Design Target, and Effect. Type of “Light” is the word described as light focused by the designer. Disposition is the word described for the role and the state, inherent in the “Light”. Design is (a description word for the intention of building by the designer) the word described as the act to building by the designer. Design Target is the word described the component of the building subject to design. Effect is the word described an action caused by design.

 3. Cross Tabulation is performed in Design and Design Target. Design Method is derived from a combination of Design and Design Target.

 4. The relationships between Type of “Light” & Disposition, Type of “Light” & Design Method, and Type of “Light” & Effect are analyzed in correspondence.

 5. Based on the tendencies of correspondence analysis contents are derived, and a matrix is made to identify aspects of “Light”, which are then categorized into types to provide insights.

 Through the investigation of the matrix between Type of “Light”, Disposition, Design, Design Target, and Effect, 22 different types of poly- morph of “Light” were derived. As a way of dealing with “Light” by designers, there were four main points; attenuation that weaken light, convergence that intensifies light, indetermination that makes light change, and stabilization of the state of light. From the above, designers deal with light as confrontational existence such as increase and decrease of light quantity due to attenuation and convergence, or indetermination and stabilization of the state of light. In addition, designers use dual character of light, such as attenuation and indefiniteness utilizing the natural properties of light, and control, such as convergence and stabilization, by intentionally operating light.

 Designers deal with light as confrontational existence such as increase and decrease of light quantity due to attenuation and convergence, or indetermination and stabilization of light. And this contradistinctive concept about light is expressed strongly on the design method by designers. Light has a wide range of influence through the buildings, even to the extent of imaginary and reality within human beings. On the wide range of influence, designers create the fluctuation and equilibrium of light. Many of events can adjust the influence from outside or exist as a special state being inside. From these events, this paper focuses on the light that necessarily causes the original phenomenon through primary behavior of design, like placing a column or a roof on an empty space. Especially on figure 4 and chapter 6, a large number of feasible aspects form the light, is derived as much as possible and the discussion about light is enhanced.