Colours alive, living colours, colours that are alive, whatever that should mean.
In my experience, colours express the feeling of being alive. Black and white is just as beautiful but always have something of a registration. Skilled and beautiful, powerful or with great precision, nevertheless always as a form of registration. Perhaps because colour is always there. Even in the twilight or when black and white stand together, shades create a feeling of it being alive. Living colours, colours alive, I think all is said.