In June 2019 OSBN, the Polish Natural Building Organisation, invited to a Festival in Lodz, showing straw bale construction, clay plaster and other natural building techniques. Presentations of international straw bale and clay-craftsmen showed the variety of international and Polish construction techniques and research in the field of Natural Building. Maciej Jagielak (ESBA Secretary, OSBN) and Przemek Raj (OSBN) invited to this event.