To describe the nature of the mind, the analogy of space is used. The mind is likened to space because space has no shape, no colour, and no characteristic. It is free from any conditioning or characteristic at all. In this way the example of space provides a suitable analogy to describe the nature of the mind. But there are other aspects to the mind - its radiant clarity and unobstructed compassion - that space doesn’t possess.

-- Yangthang Rinpoche