Answer:
What holds names and memories which are not its own?
Being able to interpret the letters on this screen proves that you have this quality.
Snake coiled round and round. Snake deep below the ground. Snake that's never had a head. Snake that binds but not with dread.
One by one we fall from heaven down into the depths of past, And our world is ever upturned so that yet some time we’ll last.
I'm full of holes, yet I'm full of water.
Who makes it, has no need of it. Who buys it, has no use for it. Who uses it, can't see it. What is it?