60Jones, Carleton. Temples of Stone: Exploring the Megalithic Tombs of Ireland. Cork: Collins, 2007. 157.
On the subject of the triple-spiral Jones writes, "If it was envisaged as a connecting vortex by the Neolithic people, it is possible that it only 'opened up' for these few days each year. Who might have traveled along this vortex when it did open? Two likely possibilities are shamans and the dead."
Celtic Christians have sometimes used the triple spiral to represent the Christian Holy Trinity. Celtic Reconstructionist Paganism and Wicca use it to represent a number of three-fold concepts in their belief systems, such as the "three realms" of Land, Sea and Sky.("Triple Spiral." Wikipedia, the Free Encyclopedia. Web. 30 Jan. 2012. <http://en.wikipedia.org/wiki/Triple_spiral>.)