 Under his direction the company prospered by supplying bricks to building projects in Copenhagen.With his wealth Hage subsidized the National Museum (Statens Museum for Kunst), but in 1908 decided to found his own art gallery, the "Nivaagaards Malerisamling", with 150 paintings.He opened it to the public and in 1908 he made up a will in which he bequeathed the entire collection to the state, along with the museum building and a capital of 60,000 Danish marks for maintenance.