Five Water Balloons

A man owned five water balloons, That he had kept as souvenirs. He stored each one in its own box, Where they'd survived for many years. One box was made of platinum, Studded with Rubies, all around. Inside, it was lined with ermine, That's where the red balloon was found. Another box was made of gold, Bejeweled with diamonds, round about. Within, it was lined with velvet, The yellow balloon's box was stout. A silver box held another, And there were emeralds set therein. The box had a satin lining, And the green balloon dwelled within. Then there was an ivory box, Set with sapphires on every side. It was lined with the finest silk, The blue balloon was found inside. And last there was a wooden box, Its creator was quite adept. Skillfully carved from knotty pine, That's where the pink balloon was kept. So when you look at every box, And the riches of which they boast, Which of the five water balloons Do you believe is worth the most? For these balloons are much like us, Within our homes, fast cars, and frocks. We measure one another's worth, By the treasures that form the box. We value wealth and position, Covet beauty, power, and fame. If someone has what we desire, We raise them up, and praise their name. We build a box like those above, And lock it with a golden key. We hide the truth within that box Where prying eyes will ever see. We choose our boxes every day, And often do so, far too soon. What does a box have to do with The worth of a water balloon?