Two
The wall of money. A director like Ray does not need any dialogue to make a masterpiece.
We see 2 children, a rich boy alone, bound in his superficial apartment and a poor boy, playing in the grass.
The rich boy may shoot down the kite, and play his music louder than the flute and dhol, but his noise can never beat the flute, and his gun can only destroy, not satisfy. He'll always be in his cage, still unhappy even with all the things money can buy.