One poor, one rich.
They're both playing with their toys; the rich one in his large mansion and the poor one in the tall grass near his hut.
They see each other and start to make more and more noise.
The poor boy grabs a beautiful kite and lets it float on the wind. The rich boy sees it, gets incredibly jealous and shoots it down with his toy gun.
A parable as simple as they get - a child could literally understand it - yet somehow our world still seems to get divided in such ways.