Quote from : The Left Hand of Darkness Book

All brightness was gone, leaving nothing. We stepped out of the tent onto nothing. Sledge and tent were there, Estraven stood beside me, but neither he nor I cast any shadow. There was dull light all around, everywhere. When we walked on the crisp snow no shadow showed the footprint. We left no track. Sledge, tent, himself, myself: nothing else at all. No sun, no sky, no horizon, no world.