The Avtovo Metro Station underground hall has 46 columns supporting a flat ceiling. Of these, 30 are faced with marble, and 16 with decorative plates made of cast glass panels with a reverse relief. These glass panels have been designed by a specialist in optical glass and they create an optic illusion. This optical effect hides the concrete structure and the columns seem to be made of “solid crystal,” almost like glass monoliths. In 2014,The Guardian included it on its list of the 12 most beautiful metro stations in the world.