Folio® was designed by Konrad F. Bauer and Walter Baum, and released in several weights and widths by the Bauer Type Foundry from 1956 to 1963. This legible sans serif family was designed around the same time as Helvetica, and in many ways it is quite similar to Helvetica. There are some notable differences in certain characters, like the lowercase a, and the caps G and Q. The designers of Folio worked as a team on several other Bauer types, including Volta and Impressum. Konrad Bauer was also a notable typography teacher and historian; he wrote the book "Aventur und Kunst" in 1940. Use Folio when you need to communicate competence and clearness, and when you want something just a little bit different from Helvetica.