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team — Daniel Kreier, PhD student in the research team Ultrafast-Imaging of Peter Baum, recorded how the construction of an experiment develops in which the microcosm can be monitored four dimensionally. This movie »Construction in fast motion« consists of individual pictures of the construction taken by a camera from precisely the same position every day. In fast motion, the finished movie shows what happened in the laboratory from March 2012 to August 2013. Using the new beamline, the researchers create flashes from electrons which only last a few femtoseconds or attoseconds. The flashes repeat hundreds of thousand times per second. With this technique, positions and movements of atoms can be monitored spatially and also temporarily, which means in the fourth dimension.