There's really nothing wrong with Google Glass as a technological experiment.

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If someone makes a wrong turn, Project Glass would alert the wayward player of this mistake with a visual or audio cue.

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"We want to engage people who come by when the gallery is closed, who are on the wrong side of the glass, " Mr. Olivier said.

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At a party hosted by one of Mobutu Sese Seko's crooked lieutenants, Michela Wrong failed to drain her glass of pink champagne swiftly enough.

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'Wrong' say the sake-swilling glass half-fullers.

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"It depends on what's wrong with it, " said Sara Blumberg of Glass Past, a rare-glass dealer.

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The second is more complicated: metallic glass is an odd material and many will get this wrong.

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