The landmark of Dortmund is the big U on top of a former brewery building. Today the building houses besides others the Museum Ostwall and some exhibition rooms. The elements looking like mosaics are actually movies shown high over the city.
At the top of the building there is a video installation, named U-Turm Bilderuhr (U-Tower Picture Clock) which shows different movies 24 hours a day. The movies aren’t shown on huge screens but on 1,7 Mio. LED spots which are attached at the façade. The photo above shows how one can look through the construction holding all these LED spots.