He changed shoes, into a pair of basketball sneakers, but with lifts on the left side, which would alter his step and throw off any gait recognition software. 6 Then he went to work on the facial recognition side, putting on a pair of thick, glossy black Nike AR glasses, and slipped in a set of prosthetic teeth with an overbite. A small foil pouch held a moist wipe, which he ran over his cheeks, lips, and chin. 7 The girl on the train’s anti-surveillance makeup was for fashion. People who weren’t just playing at rebellion used skin lotion with microscopic refracting beads. The beads were invisible to the eye, but they distorted camera imagery at the pixel level.