On the biological level, ‘hole’ has fertilizing power and is related to fertility rites; on the spiritual plane, it stands for the ‘opening’ of this world on to the other world. Worship of ‘perforated stones’ in one form or another is very common all over the world (Cirlot, J. E. 1971: 149. ‘A Dictionary of Symbols. Second Edition’. London: Routledge & Keegan Paul Ltd).