Abstract
The summary is as follows: Viollet-le-Duc's rationalism constituted the essential parts of his paintings. This rationalism between mechanics and form of Gothic is transformed in his paintings into the unity of dualism, such as reason and emotion, which formed his basic concept of architecture. The artistic production can be interpreted, so to speak, as "unity of double changes", as unity of double changes such as construction into form, form into construction, for example. In searching for this idealistic unity, he encountered "L'espace indicible" which exhibits the basic Body of Modern Age, resonant with nature in his creation.