Luke found the lid to a plastic storage tub, the storage piece of which has long since disappeared.
When he saw the image stuck on the lid, he said to John, "I found the thing you changed my diapers in when I was baby."
Luke equating this symbol:
to something that is an acceptable activity, or blocking out that symbol from his vision completely, explains so much about his behavior and personality. It also reaffirms my belief that I am in for a wild ride with him.