No, I don't mean the ability to look at someone's smile and know they're happy, or to see their frown and know they're sad.
I mean the ability to read faces, as in the ancient Chinese art of mien shiang. With the proper know-how, you can understand a lot about a person from their face alone. Check out this picture from the Mien Shiang Institute. On that face you can see lines of grief, of lost love, of heartbreak. You can see a "suspended needle" between the eyes. All of these "wrinkles" are actually forms of information--which is to say, to one person they are just wrinkles, and to a face reader, you can see a person's life in them.
I've been studying mien shiang for about ten years now, and early on in my journey I decided not to take it too seriously, because in one of my closest relationships, the other person's nose indicated some life issues that I knew were false for that person.
Only then, years into knowing this person, they confessed a lifelong secret that ended up confirming what their face had said all along. I took it as a verification that mien shiang can actually be very accurate.
Colors, marks, sizes, shapes
In face reading, everything matters. The size and shape of each part of the face. Its coloration. Any marks--wrinkles, moles, warts, skin tags. They all have meaning. The ears reflect our early childhoods--but also reflect certain talents, such as musical ability or creative writing. The eyebrows signify the capability for anger (the more eyebrow you have going on, the more prone to anger). The area between the eyebrows, the yin tong, indicates the relationship with the father. The overall shape and coloration of the face itself indicates the primary Chinese element that person channels (metal/grief, fire/mania, earth/worry, etc). If you know what you're looking at, you can discern a lot about a person by examining their face alone.
Mien shiang is a very Taoist skill. And as you know, I do love the Tao!
I've thought about teaching a series of classes on this skill for some time. If anyone is interested, please leave a note in the comments. I'm still trying to decide if I want to do it.
The face is an amazing source of information. Face reading can turn images into information and be an amazing tool for healing (through facial "diagnostics" both physical and emotional) and just for getting to know people better.