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An MIT Media Lab team has developed a series of wallets that react physically when you spend electronically:

The wallets communicate with your bank via a bluetooth connection to your smartphone and come in three variants. The “Mother Bear” has a hinge that gets harder to open as your balance dwindles. The “Bumblebee” vibrates every time a transaction gets processed, with one vibration for debits, another for credits. And the “Peacock” swells and shrinks along with your account balance.

“An unusually high balance results in a wallet large enough to be visible to potential mates,” write the researchers.

Yesterday, we scoffed.

Today, we need these.

Smart wallet gets harder to open as you spend more (Consumerist)