This paper covers the reconstruction of three castle towers from the Warring States period, each at the summit of a steep precipice. In Gifu the reconstruction was done by a local historical preservation organization. It is a simple permanent structure built using scrap lumber. In spite of criticism, the foundation was also rebuilt. In Sumoto a modern ferroconcrete structure on pilings for the lower level was built as a rest area and observation platform. The reconstruction in Ueshi was privately financed by the Nanjo family. All three are simple structures that don't attempt to accurately reproduce the original castle towers.
