Human emotions and physiognomy.
Physiognomic image and hexagram Yih-King 15.

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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 past / inevitably final chronology of subjective human achievements.
Mouth: events are in the present / relative chronology of subjective human actions.

Person realizes that at present time there are events which already was.

Analytical formulas of the canon of changes.
1 (eyebrows) definite thinking is (mouth) indisputable evidence of (eyes) unconvinced existence.
2 (eyebrows) unforgettable reminiscences are (eyes) disappearing displays of (mouth) authentic past.
3 (mouth) objective assumptions are (eyebrows) evident projections of (eyes) irrelevant future.

Light can be considered as display of fundamental world category of movement, and also can be correlated to physiognomy of a human face and symbols of emotions, and accordingly can be compared with hexagrams of the canon of changes. It allows to analyze physical parameters of movement and psychological aspects of mental perception of light waves from the view point of universal logic system of 64 hexagrams which are symbolical projections of universe. Or it is possible to tell symbolical displays of mystical light of divine Pronoia according to which the world building is constructed.
Look information about mystical light of Pronoia on pages of this website in section which has the name: divine categories.

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Following 16 facial image in gallery.
About psychological aspects of physiognomy and symbolical projections of universe, and also sources of lighting waves.