Upper trigram
☴
Wind · Xun
Gentle penetration.
FamilyEldest daughter
ElementWood
Hexagram 20 of 64
☴☷ Contemplation
Standing back to see the whole.
Lower trigram
☷
Earth · Kun
Receptive yielding.
FamilyMother
ElementEarth
The image
Wind above, Earth below.
Wind over Earth: gentle penetration meeting receptive yielding.
That combination is the whole meaning of hexagram 20. 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.