The frosted-glass doors on the 11th floor of Google’s NYC headquarters part and a woman steps forward to greet me. This is an otherwise normal specimen of humanity. Normal height, slender build; her eyes are bright, inquisitive. She leans in to shake my hand and at that moment I become acutely aware of the device she’s wearing in the place you would expect eyeglasses: a thin strip of aluminum and plastic with a strange, prismatic lens just below her brow. Google Glass.