Not long ago, the great Serbian-American poet, Charles Simic, discovered in the book called A Dictionary of Angels that “the angels were once as plentiful as species of flies. The sky at dusk used to be thick with them. You had to wave both arms just to keep them away.” Today it’s different - there are no angels in the sky. After all, if there are some left, they certainly cannot be seen, except in the movies or in the Renaissance paintings and frescoes on the walls of the Byzantine churches.