Human beings are the only primates that show the whites of their eyes. This gives us a unique range of possible signals that we can communicate with just our eyes. By knowing what different eye signals mean, and how to make those signals, we can more effectively get others to trust us and like us instantaneously. Contracted Pupils versus Dilated Pupils You may have noticed that your pupils contract (get smaller) or dilate (get larger) when your mood changes. When you get excited about something, your pupils can actually dilate up to four times their original size – that’s pretty drastic! Conversely, an angry or negative mood can cause your pupils to contract a lot . You probably have angry coworkers or friends who complain to you: next time they do, notice how their pupils become “beady” or like “snake eyes.” Say you want to dilate your pupils on purpose to convey your interest or excitement in what someone else is talking about. How can you do this intentionally? Thankfully th