The key to creating comfortable internal environments is to consider and reproduce the normal natural environment for human comfort while designing to accommodate the technology with which people coexist. The concept is to create comfortable, balanced environment. This concept incorporates the following 3 points. 1. PTM creates harmonious environments for People in present generation to live and works in order to avoid leaving environmental burdens for future generations. 2. PTM recognizes that every elements in an ecosystem must be in a perfect balance for life to flourish PTM is concerned about all elements in nature & their perfect balance. 3. PTM designs integration space of Technology and Environment, which generally conflict each other.