It captures the earth under its rule every half day equally to the sun.
It does not give up its trying on day time too.
It hides itself as shade behind animate and inanimate objects!
If the sun attempts to eliminate it,
it can not achieve it completely.
If men run too, it will follow them as a spy
till its winning time comes.
People also like to rest under the shadow of darkness
to escape from the light man.
Nobody can destroy it at night. Let's light a lamp.
It would be under the lamp too!
Look at moon, the friend of darkness.
It has darkness one side fully and also
has some darkness on facing side to the earth.
So, it is a dark moon not bright!
Darkness of night gives resting period to tired people.
If there is no darkness,
nobody would have known existence of light and
there is no value to light.
There is no imaginative power on day world, but
numerous new dreaming worlds are born in darkness.
We are born from darkness of our mother's womb.
We are going to stay permanently in darkness of tomb.
Above all, after thousands and thousands years,
there will be no sun, but darkness will last forever...
So, I do the heading!