Even though that little square has turned into a credit-card-sized thing, it is not a credit card after all. This card is not hardened like plastic. It is like construction paper at best. On one side of this rectangular card, it has some lines drawn, showing which side is north. Showing doors. Exits.
"What the F*k! This is like... a map? I would think having a security pass into the White House is more important than a map!"
Bob then picks it up, and he flips the card to the other side, "Jack, this card does double duty. The other side of this thing has a barcode, which reminds me of a high level security clearance pass I have seen once. Don't ask me how I know!" Bob waves his hand, already anticipating Jack would ask that.
Jack laughs, "OK, I'm not going to ask how you know. So, a barcode is enough as a pass?"