Seijo Sanko Koun-ji - Material Experiment (33) is a contemporary religious structure completed in 1991, designed by Suzuki Ryoji Architects and Planning. Located in the Seijo district of Setagaya, Tokyo, this sacred building exemplifies innovative architectural thinking through its experimental approach to material expression. The work represents part of Suzuki's ongoing investigation into how materials can communicate spiritual and philosophical concepts. The structure demonstrates a refined minimalist aesthetic while serving its function as a place of worship, making it a significant example of late twentieth-century Japanese religious architecture that merges contemplative space with material experimentation.