Titch is little. Everything he has is little -- his little pinwheel, his little tricycle. He even plays a little whistle. Peep. 
Pete and Mary are big. Everything they have is bigger than Titch's, and better. Their big bikes go faster. Their big kites fly higher. And their huge instruments are much louder. BANG! 
But then Titch gets a little seed. And what comes from it is a hundred times bigger then anything Pete and Mary could ever have!