"And this will be a sign for you: you will find a baby wrapped in swaddling cloths and lying in a manger." -Luke 2:12 ESV
Almighty God cam to this earth and chose to be born in a manger (an animal's feeding trough) probably in a cave or stable. What humility! Through this God shows that He came for all people regardless of social status. He is the Savior of the world!