This resource explains how nonverbal communication can supplement or replace verbal communication. One thing to remember is that people tend to believe nonverbal communication more than verbal communication. It also explores time, physical characteristics, body movements, touch, paralanguage, artifacts, and environment.
Nonverbal Communication Is Confusing and Contextual
Nonverbal communication can be confusing. We need contextual clues to help us understand, or begin to understand, what a movement, gesture, or lack of display means. Then we have to figure it all out based on our prior knowledge (or lack thereof) of the person and hope to get it right. Talk about a challenge. Nonverbal communication is everywhere, and we all use it, but that doesn't make it simple or independent of when, where, why, or how we communicate.