Before eating, everyone exchanges Christmas greetings with each other. The supper begins with the breaking of the opłatek. By sharing a piece of Christmas wafer ("Opłatki"), when everyone at the table breaks off a piece and eats it as a symbol of their unity with Christ. The opłatek is usually blessed by the presiding Bishop, and stamped with a religious image, such as the nativity scene, they then share a piece with each family member. A tradition exists among some families to serve twelve different dishes at Wigilia symbolizing the Twelve Apostles, or perhaps, an odd number of dishes for good luck (usually five, seven, or nine). Some practice the superstition that an even number of people must be seated around the table.