“These photos are from a small book called ‘Bauten der Arbeit und des Verkehrs’ (buildings of work and transport) 1925, one of ‘Die Blauen Bücher’ (the blue books), a series of thin paperback books on art and architecture. Apart from depicting interesting expressionist or mordernist architecture, the pictures also seem to have a great ‘Neue Sachlichkeit’ appeal.” - link