Exterior perspective, extension proposal, watercolour, gouache, pencil and ink on cardboard, ca. 1931, 38 × 41 cm, ARKM.1973-05-02525. Sigurd Lewerentz (1885-1975) was one of the greatest architects in modern history, and one of the greatest artists of any kind that Sweden has ever produced. Until now, however, there has never been a comprehensive exhibition about his work.