The emptiness of entityness (one of five types of emptiness discussed within Buddhist philosophy) is illustrated … with the example of a cairn and a human being. Both exist and are mutually exclusive…a cairn when viewed from a distance can easily be mistaken for a human, whereas upon closer inspection, there is nothing whatsoever that is human about a pile of stones. A human is utterly absent there. A rope mistaken for a snake would seem to be another example of the emptiness of entityness.~D. Lopez, Jr. (The Heart Sutra Explained, p54.)