Byggekunst Bjelken Espen Surnevik sjuende 7. essay arkitektur Klopp wycoller lancashire england grindverk pantheon paris jacques-Germmain Soufflot jean-baptiste rondelet mausoleum the crystal palace london joseph paxton hennebique bjelke bjelker palais de iena auguste perret paris frankrike pavillon suisse paris le corbusier pierre jeanneret sverre fehn paviljong venezia