Architecture and the spatial fluidity of daylight

“In the life of man, the house thrusts aside contingencies, its councils of continuity are unceasing.” (Gaston Bachelard, 1957) More than 20 cities have more than 10 millions inhabitants nowadays, and in the past few years, people have spent more time in residences (Hesam Kamalipour, 2020) finding the method to optimize the daylight without compromising spatial characteristics and human well-being is a task for architects and engineers. The importance of daylight in creating meaning and experience is not only an application to increase the indoor environment quality, but also a design message from architects.How can daylight in architecture be assessed for a "spatial fluidity" in domestic spaces is an important issue in human society. This thesis contains the investigation following visual-physical theory (M Madsen, 2007) of light-zone(s) as a tool to facilitate the analysis about the daylight conditions of the space and visual- perception of light parameters (Anders Liljefors). The investigation follows the case of Row House in Sumiyoshi by Tadao Ando which only addresses a patio in the middle and two small windows in each room that avoid humans being affected by the view from the outdoor environment. The comparative analyze in this research is an attempt to contemplate qualitative result with observation and calculation as an reference in relation to subjection perception and emotional response for architectural design process