In short: When you don’t have the opportunity to look in the eyes of your partner and yet still have to coordinate your movements, you can try activating your internal radar. When extracting the victims of an earthquake, rescuers must often rely on their intuition alone. Occasionally, the same intuition betrays one of the heads of two neighbor states, leading to war. This echoes Felix Gonzalez-Torrez’s work The Perfect Lovers (1991): two identical wall clocks are hung next to each other and started simultaneously. After a week, the clock on the left is already three minutes behind.