Alvar Aalto, “Sanatorium,” Paimio, FINLAND, 1929 A-wing is the patients' wing with the sun balconies, the most important architectonic element, facing south. B-wing contains the common spaces: treatment rooms, dining hall, library and common rooms. C-wing contains the laundry, kitchens and staff accommodation. The single-storey D-wing contains the boiler room and heating plant. Circulation centres on the main entrance hall between A-wing and B-wing and the stairwell linked to it, which together give access to the other wings of the building.