In his 1979 book "Architecture and its Interpretation", Juan Pablo Bonta put forward a theory about how buildings and architects achieve canonic status. He argued that a building and its architect achieve iconic or canonic status after a period when various critics and historians build up an interpretation that then becomes unquestioned for a significant period. If the text itself receives canonical status, then the status of the architect is further endorsed. For example, in the first edition of Siegfried Giedion's book "Space Time and Architecture" (1949) the Finnish architect Alvar Aalto was not mentioned at all. In the second edition he received more attention than any other architect, including Le Corbusier, who until then had been understood as the most important modernist architect.