Pond becomes a magnet to wildlife during a frost

Ladle Hill, Hampshire This neat circle of blue is the only unfrozen water for a kilometre in each direction

Refreshed by the labour of the climb, my legs nonetheless argue for respite on the crest of the hill. And, just as it does on the map, the dewpond appears a little way below me as a neat circle of blue reflecting a flawless sky on a day of hard frost.

The pond is at the very top of the downs. On one side is flint-spewing earth, which in summer is covered in a yellow cowl of rapeseed. And on the other is grazing pasture capping the concentric earthen rings of the iron age fort that stands sentinel on the hill's northern ridge. The lightest of winds twitches the smears of wool caught on wire barbs. Up here 'There is no life higher than the grasstops / Or the hearts of sheep"', as Sylvia Plath wrote of the West Yorkshire moors in Wuthering Heights, her poem of exquisite introspection.