Let me explain
Snøhetta composed the building as a group of pebbles: a 110 metre main tower with the Library, the Auditorium and the Great Hall resting on the ground, and a fourth pebble, the Keystone, suspended between the tower and the Library like the keystone of a Roman arch (Snøhetta). Spanning 80,000 square metres, Ithra houses a library of around 400,000 volumes across four floors, a 900 seat theater, a 300 seat cinema, a museum with five galleries, a 1,600 square metre Great Hall, the Idea Lab, the Energy Exhibit, the Children's Museum and Ithra Tower. TIME named it one of the World's 100 Greatest Places, and it has welcomed more than 6.5 million visitors since opening (Ithra Factsheet 2025).