Japanese modern architecture, Art Tower Mito

One of the most ingenious constructions in Japan is the Art Tower Mito, a 100 meters tall tower designed by the architect Arata Isozaki. Its shape is a geometric figure called tetrahelix (also known as a "Boerdijk–Coxeter helix"), a stacking of tetrahedrons with variable orientation.

An interesting fact about this geometric object is that it can be made by folding a single sheet of paper and you can visit the Art Tower Mito page for a complete origami model. The tower is made from 28 tetrahedrons and features a beautiful observatory at the height of 86 meters.