Armchairs are placed on metal frames, the biggest of which can be 5.5 m tall. Modules are levelled with respect to each other. Every module is equipped with rows of armchairs and railings that ensure users’ safety. Particular elements can be combined and built in different configurations, just like LEGO bricks. The modules are easy to move because they have self-turning castors. Despite the fact that the highest mobile auditorium weighs almost 1.5 tons, it can be moved by only three people.