Abstract
Good neighbors are rare. Those who are most proximate might offer the potential for mutual assistance and reassurance. Mistrust and rivalry, however, seem endemic among individuals and groups sharing space and resources. Schopenhauer's simile refers to porcupines who huddle together in the winter to keep warm, but separate as they feel each other's quills, until they discover “a mean distance at which they could most tolerably exist.” Referring to Schopenhauer, Freud observed that “No one can tolerate a too intimate approach to his neighbor.”

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