Imagine a world where you barely notice the barriers between digital and physical space. Instead of looking at a TV or phone, you have a pair of glasses that can project a screen anywhere. You can seamlessly pull up translations for any street sign or instructions for any task. You can amplify a difficult-to-hear conversation through an earpiece or highlight a hard-to-see detail in your surroundings.

Now imagine the same world — but your glasses scan every conversation to personalize a barrage of advertising. Some locations are replete with helpful holographic instructions, while in other places, neglect and poor connectivity make them few and far between. A sophisticated facial recognition system tracks every stranger you encounter......

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