We had a wonderful holiday in May in the East Neuk of Fife, staying in the village of St Monans. One of the features is the old seawater bathing pool, now disused. You can read more about it in this article.
The still water provided a perfect mirror for the sky.
It was also a perfect stalking point for a heron.
a lens in the landscape 
Some very striking mirror photos here. Lovely.
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