Waves and Lines
Tolkien uses the term "sky-fields" once in Lord of the Rings, in the third volume, Return of the Kings:
'It is all dark, but it is not all night,' said Ghân. 'When Sun comes we feel
her, even when she is hidden. Already she climbs over East-mountains. It is the opening of day
in the sky-fields.'
Even when we cannot see it, there is hope.