Upper trigram
☰
Heaven · Qian
Creative force.
FamilyFather
ElementMetal
Hexagram 10 of 64
☰☱ Treading
Careful conduct in a dangerous position.
Lower trigram
☱
Lake · Dui
Joy and openness.
FamilyYoungest daughter
ElementMetal
The image
Heaven above, Lake below.
Heaven over Lake: creative force meeting joy and openness.
That combination is the whole meaning of hexagram 10. Nothing about it is arbitrary — change either trigram and you get a different hexagram with a different reading, which is why the 64 form a system rather than a list.