Answer:
It cannot be seen, it weighs nothing, but when put into a barrel, it makes it lighter.
Left to right Iām quite bright. Right to left I might bite.
I can be written, I can be spoken, I can be exposed, I can be broken.
This is in a realm of true and in a realm false, but you experience me as you turn and toss.
You can hold it without using your hands or arms. What is it?
Walk on the living, they don't even mumble. Walk on the dead, they mutter and grumble.
Difficult
Animal
Easy
Food
Funny
Kids
Logic
What am I?