Ymir's hair

[The Perilous Dreamer]

Ymir's hair, Odin, Vili and Vé used his hair for the trees. (Norse mythology)

[The Perilous Dreamer]

Ymir

The gods Odin, Vili and Vé fashioned the Earth (elsewhere personified as a goddess; Jörð) from his flesh, from his blood the ocean, from his bones the mountains, from his hair the trees, from his brains the clouds, from his skull the heavens, and from his eyebrows the middle realm in which mankind lives, Midgard. In addition, one stanza relates that the dwarfs were given life by the gods from Ymir's flesh and blood (or the Earth and sea).