Уголковый отражатель для радара.
dic. academic. ru/dic.nsf/ruwiki/1121037
It is the real hologramme, has been made by aliens from their UFO because, they wish to to warn people of Moscow about fast flooding which Moscow will occur in 2011-2012 it is located in low level, during flooding many people can die.
Anybody knows russian? So we can know the source of those videos.