The human being is as different as possible from a stone, yet man’s innermost center is in a strange and special way akin to it (perhaps because the stone symbolizes mere existence at the farthest remove from emotions, feelings, fantasies, and reasoning by the ego-consciousness).

In this sense the stone symbolizes what is perhaps the deepest experience – the experience of something that is eternal that man can have in those moments when he feels immortal and unalterable.

The holiest sanctuary of the Islamic world is the Ka’aba, the black stone of Mecca to which all pious Moslems hope to make their pilgrimage at least once in their life. ~Carl Jung, Memories Dreams and Reflections.