A physical indicator of virtual reality, this leather wallet actually gets harder to open as funds decrease. The wallet “knows” how to behave based on a bluetooth signal from your online banking account.

Developed by The Information Ecology Group at the MIT Media Lab, The Proverbial Wallets project also includes a concept for a wallet that vibrates to signal virtual banking transactions, and another that physically swells and shrinks according to available funds.

Tangible Tuesdays features new finds in tactile interaction design each week.

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