In developing a dome with a diameter of 35.6m and a height of 6.95m, the idea was to use an inexpensive and light-weighted box beam (PHP system) of paper honeycomb board sandwiched in structural plywood, as a substitute for huge glulam arches. However, with a large span and snow load, the paper honeycomb was replaced with a regular wooden box beam. The next project, Student Built Campus at Keio University SFC implemented the PHP system.
![](https://shigerubanarchitects.com/wp-content/uploads/2023/04/K2A9670-1024x683.jpg)
![](https://shigerubanarchitects.com/wp-content/uploads/2023/04/K2A9598-1024x683.jpg)
![](https://shigerubanarchitects.com/wp-content/uploads/2023/04/DSF1567-1024x768.jpg)