If you've ever read a negotiation book or taken a communication workshop, you've likely heard of "mirroring": subtly copying another person's body language to build rapport. They lean in, you lean in. They smile, you smile. The idea is intuitive. We like people who are similar to us, and physical synchrony signals connection and shared understanding. When done well, mirroring can strengthen relationships and increase trust. I've spent years teaching nonverbal communication at Stanford Graduate