In our time, we seek for qualify rather than quantity in interior-space. Curved wall space is one example and become comparatively popular of interior-space. The view point of this study is to investigate the effect which curved space exert upon one's psychology. Then in experiments, changing form of curved wall space make the different cognized spaciousness, depth and image of interior-space clear. And by means of comparing the aspects of space recognition in reduced models with each other the result of the experiments gave us some information which can be applied to interior-space design.%1）広さ感は同体積?同奥行き?同高さの空間でも両壁の壁のあり方によって異なる。側壁の壁を曲面にすることで、先拡がり型凸面の曲率0.2~0.5で約6％~7％ほどであるが大きく感じさせることができる。先拡がり型凹面の曲率0.4~0.5で，約7％~8.5％ほどであるが大きく感じさせることができる。その逆も可能である。
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