light or dark ???

the light is so white, the dark is so black ....
what's about sky ??? why ???
sometimes sky is so bright, but sometimes sky is so dark ....
dark is very cold,  but light is very hot ....
what must we do to make it's warm ????

light glare at all, but the dark is very lonely and very quiet...
what about sky ???why ???
what is true sky from ????light or dark ???? 
why sky always change dark or light when we didn't know ....
is the meaning of sky is ... 
GOD FEELING ...????


so what is sky ...
LIGHT OR DARK ???