Need help working out the name of a famous painting!?

Ok so the painting is of a white cello, i think, and a body which goes from the hips to the neck, also i think. They are both floating in a pale blue sky and there's a few clouds. I think the name is something along the lines of "dreaming" or "dreamtime" but google doesnt seem to recognize either. The artist is fairly well known but i can remember who it is! Can anyone help?! x