Translucent and reflective surfaces ricochet light around Cologne apartment

German architecture studio Demo Working Group has removed all non-structural walls from this 1970s high-rise apartment in Cologne, creating a utilitarian open-plan interior.

Named Kier after its address on Kierberger Straße, the apartment is set in a housing block built in 1972. Before the renovation, wallpaper covered its concrete shell and a myriad of dividing walls created dark, enclosed rooms.

Now, a structural concrete...