Calatrava's 2005 Malmö twisting residential tower — 90° rotation over its height, structured around a central core.
From Wikipedia
Turning Torso is a neo-futurist residential skyscraper built in Malmö, Sweden, in 2005. It was the tallest building in the Nordic region until September 2022, when it was surpassed by Karlatornet in Gothenburg. Located on the Swedish side of the Öresund strait, it was built and is owned by Swedish cooperative housing association HSB. It is regarded as the second twisted skyscraper in the world to receive the title after Telekom Tower in Malaysia.