Answer:
I am a box that holds keys without locks, yet they can unlock your soul.
When liquid splashes me, none seeps through. When I am moved a lot, liquid I spew. When I am hit, color I change. And color, I come in quite a range. What I cover is very complex, and I am very easy to flex.
Four of us are in your field, But our differences keep us at yield, First, a one that is no fool, Though he resembles a gardener’s tool, Next, one difficult to split in two, And a girl once had one as big as her shoe, Then, to the mind, one’s a lovely bonder, And truancy makes it grow fonder, Last, a stem connecting dots of three
Walk on the living, they don’t even mumble, Walk on the dead, they mutter and grumble. What are they?
You heart it speak, for it has a hard tongue. But it cannot breathe, for it has not a lung.
What never gets any wetter no matter how hard it rains?