'Termodecking'

"The Jubilee Library in Brighton has received numerous accolades for its approach to design and its 'green' performance. The building incorporates a combination of exposed cast in-situ concrete slabs in the central area, and exposed precast hollow core slabs in the perimeter rooms, heated and cooled by mechanical ventilation; a system typically referred to by the trade name 'Termodeck'... "

All that AND it makes for some nice clean lines against a short lived blue sky on an otherwise scarce-blip day...