Science Museum (London)
The East Hall is the first area that most visitors see as they enter the building, going up through three floors. On the ground, the area is mostly filled with famous steam engines of various sorts, including the oldest surviving James Watt beam engine, which together tell the story of the British industrial revolution. Up in the air, hung from the ceiling is a big metal ring, the inside of which is covered in white LEDs which form patterns and display messages typed into kiosks by visitors in the Energy gallery.