The gods the children worshipped were the nameless ones that would one day become the gods of the First Men – the innumerable gods of the streams and forests and stones. It was the children who carved the weirwoods with faces, perhaps to give eyes to their gods so that they might watch their worshippers at their devotions.
– George R. R. Martin, E. M. García Jr. & L. Antonsson: The World of Ice and Fire – Ancient History – The Dawn Age