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Really good point. I doubt they'll ever[0] be able to put all that tech into a card that's actually as thin as a credit card that fits in an ATM.

But if they can do that, I want one, not to pay with, but for the programmable eInk screen with bluetooth connectivity (and touch? get real).

Then I'd hook it into my phone, that would somehow detect who is nearby/looking at it, reverse/stalk their social networks, local graph, location/environment context, little bit of magic, cold reading and random guesswork.

It would show exactly whatever they wanted/expected to see.

I'd have hacked myself a piece of Doctor Who's psychic paper.

[0] or at least for a few years :)

ah, good point on the ATMs, I stand corrected

(imagine this card getting stuck in an ATM, suddenly all your cards are lost)

Cash machines have to deal with raised numerals. You could at least make it as thick as card + raised digits all over.

Not quite - many ATMs I've seen size the slot so the raised numbers only go in one place so you can't insert the card the wrong way around.

Ah, I hadn’t noticed that, will have to have a closer look.