In Norse mythology, the first beings created were the Ymir, a primordial giant, and his descendants. From Ymir's body, the gods Odin, Vili, and Ve fashioned the world, shaping land, sea, and sky to create Midgard, the realm of humans. This creation myth illustrates concepts of sacrifice and transformation, as Ymir's demise leads to the birth of a new world and the establishment of order from chaos. It highlights the Norse belief in the interconnection between destruction and creation in the cosmos.