49An experiment showing paradoxical consequences of this idea was performed by Afshar et. al [2] (arXiv:quant-ph/0702188) and followed by a controversial discussion [146], [72] (arXiv:0807.5079)  [52] (arXiv:1001.4785). From the point of view of the SI complementarity is a strange and contradictory concept that can be refuted for purely logical reasons