Symbiosis (noun): The interaction between two different organisms living in close physical association, typically to the advantage of both.
 
He's stubborn but grounded. She's fluid but drowning. They need each other to balance and survive... but trust is the key.
 
Several symbolic elements in this piece: the lock, shackles, ball & chain, key, water, cliff, etc. Even the placement of characters. Almost 20 years old, the meaning behind this piece is still (and always will be) relevant: We need each other.