Last month, I had a conversation with someone wearing glasses — and couldn’t see that they had a display right in front of one of their eyes. Through a monitor connected to the glasses, I watched in awe as my colleague Victoria Song scrolled through and wrote WhatsApp messages, used the display as a viewfinder for a photo, changed the volume on Spotify by turning her hand as if she was holding a knob, and even looked at directions on a map. And when I looked Victoria in the eye, while I…