Smooth as a mill pond

It was unbroken today by the  activity of the ducks.

 A sign informed us that they were having a short holiday while their accommodation is being refurbished.

So mirror-like was the surface that the reflections were as still and sharp as the reality. To prove this I have inverted the image but I think you would never know if it were not for the green grassy 'clouds' along the top right corner.