Answer:
Always old, sometimes new. Never sad, sometimes blue. Never empty, sometimes full. Never pushes, always pulls.
What can be filled with empty hands?
Never alive but practically extinct. How we miss the letters pressing the ribbon of ink. What is it?
I grow where no flower grows, where no light touches the walls, up or down, that I don't care, was here before people were.
I run through hills. I veer around mountains. I leap over rivers. And crawl through the forests. Step out your door to find me.
I'm the source of all emotion but I'm caged in a white prison.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?