Further to your article we also hold ATM cards (one per bank) and Credit cards. We have cards for entry to clubs. On special projects or project sites we have a second card for our entry permit.
With in-fashion ribbons holding cards loosely hanging from around our neck we shall soon have to colour codes for various cards and one more ribbon for mobile phones. Even attending a good seminer make us sport one more ribbon around neck to declare I am innnn.
Mankind has just started developing card culturs. Surely future generations shall have many more coloured ribbons to boast for all he is doing. All are basically ID cards.