It is a thread,
The more you pull,
The more it flattens,
The less you pull,
The more bulged it becomes.

I don't understand what to do then,
Because if I touch it,
I don't know what will happen??
Will somebody come out of thin air,
or
Will somebody else come??

That is the only reason why it is a mystery,
So is a thread,
But in it's own ways...