Form and Space
"When the eye finds nothing to see, that no-thingness is perceived as space. When the ear finds nothing to hear, that no-thingness is perceived as stillness. When the senses, which are designed to perceive form, meet an absence of form, the formless consciousness that lies behind perception and makes all perception, all experience, possible, is no longer obscured by form. When you contemplate the unfathomable depth of space or listen to the silence in the early hours before sunrise, something within you resonates with it as if in recognition. You sense that vast depth of space as your own depth, and you know that precious stillness that has no form to be more deeply who you are than any of the things that make up the content of your life."
...
"A sane, balanced, and fruitful human life is a dance between the two dimensions that make up reality: form and space. Most people are so identified with the dimensions of form, with sense perceptions, thoughts, and emotions, that the vital hidden half is missing from their lives. Their identification with form keeps them trapped in ego."
~ Eckhart Tolle, A New Earth: Awakening to Your Life's Purpose