Upper trigram
☵
Water · Kan
Danger and depth.
FamilyMiddle son
ElementWater
Hexagram 63 of 64
☵☲ After Completion
The task is done; now hold it together.
Lower trigram
☲
Fire · Li
Clarity and attachment.
FamilyMiddle daughter
ElementFire
The image
Water above, Fire below.
Water over Fire: danger and depth meeting clarity and attachment.
That combination is the whole meaning of hexagram 63. 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.