This paper reports on the development of a new VR (Virtual Reality) system with the worlds largest hemispherical screen, which can display high immersive, life-size scale, stereoscopic images. A cluster of PCs is used in master-slave architecture, with 18 slave PCs for rendering left eye and right eye images, and the master for synchronizing the images for stereo view. Contents can be shared with a VR system operating on a notebook with a new VR system developed as part of the same VR toolkit. We apply the system to a real, collaborative architectural design project