David Chipperfield stairs remind me of the staircases often depicted in optical illusion paintings. I like how glass is use for the balustrades, so the stairs are the main focus in this space. The open ceiling naturally lights up the structure.
In the Basque sculptor Eduardo Chillida Tindaya Mountain, on Fuerteventura. Chillida's idea was to create a large empty void inside, with dimensions 50 x 50 x 50 meters, with an entrance tunnel of 200 meters and two skylights.