In a strange city or unfamiliar part of town, people often behave in a curiously furtive manner when resorting to maps and guidebooks. They may turn towards a wall or move close to a nearby lamppost or bin, to minimize obstruction and conceal the fact that they are lost. The most vulnerable point comes when they try to match the map's contours with the actual surroundings, sometimes turning their whole body to assist with orientation. This phase usually lasts around thirty seconds. If their efforts are to no avail, they may try to make eye contact with passers-by, their facial expressions overtly signalling lostness in order to solicit help.