Wearable tech might require external behavioral changes and cause internal ones too. How people relate to each other when smartphones are present is a harbinger of how Glass is likely to affect human interaction.

In his 1954 text The Question Concerning Technology, German philosopher Martin Heidegger addresses the rejiggered relationship to the world that technology creates. When given a new way of interpreting reality, people lose the need to determine their relationship to it on their own, which is part of what makes us human. Heidegger says this danger can be mitigated by realizing that technology is just one way of viewing the world. But heedless of Heidegger, people walk down the street, wait in line, or while away a commute relating only to the phone in their hands.

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