This puzzle shows Jesus as a baby, laying in manger. A manger is a long bucket used to feed animals. There was no room to stay inside, so Mary and Joseph had to find shelter in a stable. A stable is an outdoor house for animals.
"And [Mary] brought forth her firstborn son, and wrapped him up in swaddling clothes, and laid him in a manger; because there was no room for them in the inn." -Luke 2:7