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Mastercard Redesigns Credit/Debit Cards with Notches For the Visually Impaired
Good thought.
Cards could be much smaller. Most time I use my card, the only working parts are the chip and contacts, or else the NFC wireless transponder. Now, if a card were even just half the width, it could be stored about one's person more easily - it could fit within a pouch in a belt, for example. Make the card just the width of the chip contacts and it could fit within a watch strap or bracelet.
differentiating between types of cards is useful but didn't the raised numbers give a clue to the orientation already? I can find the front/right of my card by touch no problemo.....