The development of architecture during this period was associated with two things: the new concepts that had emerged from the recent and growing urban phenomenon, and the concerns being expressed in the field of the arts. It is in this context - and also in relation to the ideological processes concerning the establishment of a Greek architectural practice - that the architectural output of the inter-war period should be viewed. Aristeidis Zachos is considered the predecessor of a folklore tendency, with Byzantine elements. His work consists mainly of private residences and churches, while he may also have contributed to the school building programme. Painter and engineer Dimitris Pikionis studied at Munich and Paris. He is considered the leading figure in Greek architecture and strongly influenced his fellow artists. Pikionis experimented with new forms, bringing together in a creative whole the concepts of Greek folk tradition and elements from different historical periods. Chief among his works of the time are his plans for a Delphic centre combining ancient, medieval and folk elements. The concepts of Pikionis seem to have been adopted by Nikolaos Mitsakis, who later emerged as a strict Modernist and excluded from his work every trace of traditional form. In this respect his most characteristic creations are the auxiliary buildings of Marasleios Academy. These men, together with other architects such as Patroklos Karantinos and Kyriakos Panagiotakos, made significant contributions to the school building project, and continued their work beyond the inter-war period.