Golden ratio

This is the detail of "the Impossible Staircase" from below. This staircase flaunts the fact that is has no central column and is certainly majestic.

In Torgau - the spiritual center of the German Reformation - Hartenfels Castle is the most significant building of the townscape. It's here, that Renaissance, Reformation and modern times meet in a most unique way. https://www.schloesserland-sachsen.de/en/palaces-castles-and-gardens/hartenfels-castle/

GermanyHartenfels CastleSaxonySchloß HartenfelsTorgauarchitecturebuildingsconstructionedificeengineeringformframeworkplanningspiralstaircasestairsstairwaystepsstructure