Cloud mind is the ebb and flow of conceptual mind, and Sky Mind is the still potential of the nature-of-mind. Clouds arise in the sky, flit across it and decorate it, but do not limit or define the vast empty blueness of sky. Sky always has the potential for cloud to arise. Cloud is a natural aspect of sky, but sky is not limited by cloud. Sky exists irrespective of cloud, but cloud cannot exist irrespective of sky.