The mathematical exhibition “IMAGINARY” took place in Dolgoprudny, a town in Moscow Region, from the 7th to the 21th of September 2015. The interactive travelling exhibition was organized this year by the German Embassy in Moscow and the Moscow Institute of Physics and Technology (MIPT). It was also supported by the German House for Science and Innovation (DWIH) within the frame of the “5th German-Russian Week of the young scientist”. The exhibition cough a lot of attention and was visited during the two weeks period by almost 2.000 students and scientists.