What is that one thing

What is one thing that is free of charge?

We can create it free of charge
We can create it when we are conscious
We can also create it when we are unconscious

Those who are poor can create it
As well as those who are rich

Those who are educated can create it
And those who even cannot read can create it

We can keep it
But we can also forget it

We can make it it
But we can also forget it

We can make it
Or keep it as it is

What is that?

18 December 2009