We had a special open day at Nobeyama Radio Observatory, and as many as 2572 people visited us. As part of the event, ALMA-J Project Office gave brief lectures, displayed panels to introduce the project, and played a documentary film of the site in Chile. The picture shows Tetsuo Hasegawa, ALMA-J Project Manager, explaining ALMA antenna configuration to visitors, using the diorama of the construction site on the scale of 1:10000.