White or black? Does grey exist?

I've listened about the existence of grey colour. Until know I think I only know about white or black. Today, someone made me think.

I love technology, here, one mind with only black and white colours is welcome. Firstly, that worried me.
Later I realised that I love music even more than technology and I feel an active music player, so I don't think a musician only can think in black or in white. I'm a bit confused.

Maybe I am wrong about what kind of person I want to be...
I'll go to find something out...