Human emotions and physiognomy.
Physiognomic image and hexagram Yih-King 19.

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Lineaments of a face and perception of a time.
Eyebrows: ideas are in the present / relative chronology of subjective human comprehensions.
Eyes: aspirations are in the present / relative chronology of subjective human achievements.
Mouth: events are outside of time / irrelative chronology of subjective human actions.

Person has comprehended that the instant of present time has no duration.

Analytical formulas of the canon of changes.
1 (eyebrows) definite thinking is (mouth) vague evidence of (eyes) absolute existence.
2 (eyebrows) unforgettable reminiscences are (eyes) actual displays of (mouth) doubtful past.
3 (mouth) non objective assumptions are (eyebrows) evident projections of (eyes) obvious future.

The fourth world category is the matter which similarly to other world categories corresponds with hexagrams of the canon of changes and symbols of emotions of a human face.
Quiet emotions of a human face can be compared to absence of a matter or otherwise tell absence of ratio by which the matter is interconnected with other world categories. Joyful emotions can be compared to creation of a matter. Sad emotions can be compared to disappearance of a matter. The open emotions can be compared to indestructibility of a matter.

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following image of emotions in gallery
About changes of human eyes and physiognomy.