What did the king see in his dream?

The king saw a large statue. The statue had a head of gold, breast and arms of silver, its middle and thighs were bronze, its legs of iron and its feet part iron and part clay. The king saw a stone cut, but not by human hands. The stone struck the statue's feet and the whole statue shattered into pieces which the wind carried away. The stone became a great mountain and filled the whole earth [2:31; 2:35]