In the mountains of Galicia there are many stones believed to have miraculous virtues, as evidence of indigenous cults of pre-Celtic origins, often linked to fertility rites. 
The Hermitage of San Guillerme de Fisterra, Mount Pindo and Muxía are among the most famous places. 
The primitive cultures attributed to the rocks miraculous properties by virtue of their hardness, roughness and permanence: stone that always remains itself, has power in striking and endures in the eternal, revealing the divinity that transcends the precariousness of human existence. 
In these lands, which the ancients believed the insurmountable limit of the inhabited world, the transit of souls to the islands of the blessed took place. The mythological navigators and the Christian saints were thought to guide the pilgrims on this path marked by the stones in the earth and by the Milky Way in the sky, connecting human and divine. 
In Carballo, a city famous also for its prodigious thermal waters that provide healing, there is a rock in which women who have difficulties to give birth lie to bathe in the light of the moon. It is the Pedra Moura dolmen (one of the most extensives in Galicia), located in the area of ​​Aldemunde and which it's believed to be from 3500 BC. 
"Petra Mater" is the image of a woman suspended between heaven and earth, seen from the moon, naked as stone.
This artwork is part of Rexenera Fest 2018.
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Unha muller flota na luz da Lúa.
O seu camiño foi feito de Pedras.
Nos seus ollos convertéronse en Estrelas.
Debaixo dos seus pés agora brilan.
Coas mans acolle, cos cabelos acariña, coas costas sostén.
Barco que salva, cuncha que nutre a vida.
Núa, inmutable, duradeira Pedra.