Da Vinci's Last Supper was painted on the wall of the refectory (cafeteria) of the Holy Mary of Grace church in Milan, Italy. Everyday when the monks gathered, they saw this painting and were reminded of the real Last Supper.

There are so many wonderful things to meditate on in Communion services, but this wonderful piece of art showcases the moment where Christ told His disciples that one of them would betray Him. Of all the truths to choose to think upon during Communion, this is the one Da Vinci's genius chose to depict.
There was a traitor at the Last Supper, even with King of Glory Himself being present.
I want close communion with God, to enjoy the freedom of relationship with Him that He purchased for me, and I'm glad to be reminded of that and feed on that joy when I celebrate Communion services.
But Da Vinci has taught me that it's also good to remember that Christ chooses to dine with even the evil, traitorous ones that are in His life (don't we all have them?). I should go and do likewise with others, AND be willing to let God love on me in all the places where my heart still wants to rebel against Him.
Furthermore, let it be a backstop to my heart to know the judgment of God: that even though I sit and dine with Him today and receive His mercy, I must continue to choose His mercy and forgiveness and not my own self-righteousness as the way to salvation.