Art Tower Mito interior

Seen from outside, the tetrahelix Art Tower of the Mito city offers an amazing view, because it is a precise "Boerdijk–Coxeter helix" object, a stacking of 28 tetrahedrons with variable orientation, with a total height of 86 meters.

Seen from inside, the tetrahedrons with variable orientation are creating a space sci-fi feeling, and maybe a bit of directional confusion. Anyway, it's a unique experience.