Upper trigram
☱
Lake · Dui
Joy and openness.
FamilyYoungest daughter
ElementMetal
Hexagram 28 of 64
☱☴ Great Exceeding
A load too heavy for the structure.
Lower trigram
☴
Wind · Xun
Gentle penetration.
FamilyEldest daughter
ElementWood
The image
Lake above, Wind below.
Lake over Wind: joy and openness meeting gentle penetration.
That combination is the whole meaning of hexagram 28. 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.