" Flattered by Loki’s speeches, the Dwarfs who were in the forge took up the bar of fine gold and flung it into the fire. Then taking it out and putting it upon their anvil they worked on the bar with their tiny hammers until they beat it into threads that were as fine as the hairs of one’s head. But that was not enough. They had to be as fine as the hairs on Sif’s head, and these were finer than anything else. They worked on the threads, over and over again, until they were as fine as the hairs on Sif’s head. The threads were as bright as sunlight, and when Loki took up the mass of worked gold it flowed from his raised hand down on the ground. It was so fine that it could be put into his palm, and it was so light that a bird might not feel its weight. "

― Padraic Colum , The Children of Odin: The Book of Northern Myths