All the colours of a November evening

Wenlock Edge, Shropshire There is something about the combination of sky-blue, red and black that fascinates me - I don't understand why

For a moment before dusk, the sky was sky-blue. Like looking into a pool, only overhead, the sky's edges around its horizons were pale, chalky, blackbird egg blue, deepening through Wedgwood into the above as it thickened ultramarine and darkened inkily towards space.

Oddly, the colour gained more substance as the atmosphere became thinnest, so that light itself was the material of air. From high on the Edge, the blue replaced everything I noticed about the sky: crazy shoals of rooks and jackdaws, arrowheads of geese, wraiths of starlings speeding towards murmurations.