This study was to examine the relationship with the changes of computer technologies that was influenced in human sensorial perception and the changes of aesthetical expression in architecture that was expressed in Henri Ciriani's work after 1970's. As a result, the human sensorial perception that was caused by the changes of technologies has influenced on Henri Ciriani's space concepts and expressions of materials and forms. According to it, the aesthetics in a period was determined by the use of developped technologies. In my opnion, this could be a plastic art expressions.

This study aimes to understand the principles in Theo Van Doesburg's architectural concept. Generally, Theo Van Doesburg has been thought that he betrayed De Stijl by acting contrary to the Neo-Plasticism which was constituted in early De Stijl by Mondrian and himself and by suggesting opposite one, Elementarism. Therefore this study tried to understand the principles that make his architectural concept, confirming the background of Elementarism. After studing relation, which Theo Van Doesburg has used, between space and color, it is concluded that he has unchanged principles of architectural concept from early De Stijl to last, opposite to general appreciation. So, Theo Van Doesburg acted to maintain equilibrium that exists for balancing the two elemental forces which contrast each other in relation between space and color. The equilibrium which he looked for aims to constitute harmonized dynamic space by dynamic rythem of equilibrium instead of Neo-Plastic effect. And using color, which used to be producing dynamic effect, he intended to maintain static effect for making dynamic rythem of equllibrium by the principles he made.