井底之蛙

jing di zhi wa: A frog lived his whole life at the bottom of a damp well, enjoying the puddles and flies and occasionally looking up to the small circle of sky above. One day, a crow landed on the rim of the well high above the frog. Startled, the frog asked, "How is it that you can fly around up there? There's not enough sky for a bird half your size!" The bird shouted back down, "There is more than enough sky for me. There world up here is much different and much bigger than you think. You should check it out sometime."