 Their success was short lived, however, as production was hit by the 1970s energy crisis.The late 1950s and 1960s also witnessed a reaction to the then still dominant position of Alvar Aalto in Finnish architecture, though some, most significantly Heikki and Kaija Siren (e.g., Otaniemi Chapel, 1956–1957), Keijo Petäjä (e.g., Lauttasaari Church, Helsinki, 1958), Viljo Revell (e.g., Toronto City Hall, Canada, 1958–1965), Timo Penttilä (e.g., Helsinki City Theatre, 1967), Marjatta and Martti Jaatinen (e.g., Kannelmäki church, 1962–68), and brothers Timo and Tuomo Suomalainen (e.g., Temppeliaukio Church, Helsinki, 1961–1969) developed their own interpretation of a non-rationalist modernist architecture.Taking architecture in an even more idiosyncratic organic line than Aalto was Reima Pietilä, while at the other end of the spectrum was a rationalist line epitomized in the works of Aarne Ervi, Aulis Blomstedt, Aarno Ruusuvuori, Kirmo Mikkola, Kristian Gullichsen, Matti K. Mäkinen, Pekka Salminen, Juhani Pallasmaa and, slightly later, Helin & Siitonen Architects.