Śūnya, śūnyatā, shunyata, shûnya, shunya

Śūnya, no el Espacio elemental (ākāśa), que es el sine qua non de la existencia, sino el Vacío Absoluto, que es un "aspecto" de la no-existencia. (AKC  )

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The term “emptiness” (mu) recurs often throughout The Sound of the One Hand. In ordinary usage, emptiness means the lack of a substance, such as a glass that is empty of water. But in Zen, this key term signifies the absence of any independent, separate, and fixed existence. When Jōshū answers “Mu” to the question “Does a dog have Buddha-nature?” he subverts the distinction between the questioner and the dog that is the implicit basis for the question, and says that Buddha-nature (or the “greater I”) of the dog has no existence independent of that of the individual asking the question. As the book of Ecclesiastes (3:19) says, “All have the same lifebreath.” (The sounds of the one hand)