First, most people suffer from what psychologists call “the transparency illusion”—the belief that what they feel, desire, and intend is crystal clear to others, even though they have done very little to communicate clearly what is going on inside their minds.
Because the perceived assume they are transparent, they might not spend the time or effort to be as clear and forthcoming about their intentions or emotional states as they could be, giving the perceiver very little information with which to make an accurate judgment.
“Chances are,” Halvorson writes, “how you look when you are slightly frustrated isn’t all that different from how you look when you are a little concerned, confused, disappointed, or nervous.