Abstract
The architectural design methods associated with the architectural works of Manuel and Francisco Aires Mateus were analyzed to understand the process of its form formation and spatial configuration; there were 22 projects examined and categorized by the types of patterns with spatial configuration. The results indicated that the basic concepts of Aires Mateus design entailed geometric abstraction, white, natural, and mass colors, phenomenological atmosphere with natural factors, regionalism, and placeness based on Minimalism. The main design method of Aires Mateus involved subtraction by trying to develop a solid or void relationship through connecting voids into a complex architectural pattern with unit formation, repetition, and diverse design factors. The patterns were usually used in elevation and in some cases during plan design; they were formed with louver, surface, and mass unit. Overall, the architectural design of Aires Mateus can be comprehended through a multidisciplinary combination of subtraction, connection of voids, and pattern formation. The application of the patternization principle related to unit formation in the complexity theory reflects a cutting-edge approach in contemporary architecture.