The Biggest House in the World By Leo Lionni

A young snail dreams of having the biggest house—or shell—in the world. Then one day, his wise father tells him the story of another snail with the same dream. He grew and grew, adding bright colors and beautiful designs, until he found that his house came at a terrible cost. The young snail decides that a small, easy-to-carry shell might be best for a life of adventure and exploration.