Internalizing Space

Tenzin Wangyal Rinpoche, Healing with Form, Energy and Light, page 128:

Space is the ground of everything, the fundamental reality. We generally think of earth as representing groundedness, and it does as long as we believe ourselves to be one thing separate from everything else. In duality, earth is the ground, space is the absence of ground. But in Dzogchen, space is the ground. The practitioner merged with space is more grounded than earth because he or she is the space in which earth exists; is more comfortable than water because space has no obstructions; is more flexible than air because air can go no place that space is not already; is more creative than fire because space gives rise to fire. Space is what we truly are.