When looking through the daily file of photographs moved by Reuters to newspapers, magazines and web-sites around the world, it’s the breadth and quality that makes the biggest impression.

Having said that, there is usually one image that sticks and lingers in the mind. It might not be a news picture, or it might be an image that strikes a chord with me and nobody else.

But what is undeniable is the pleasure of being surprised by something unexpected.

Take this photograph of a Ferris wheel against a stormy evening sky, shot by Heino Kalis in Valencia last week.    

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It’s not related to a story. It’s not a photograph of anything we haven’t seen before. But it is well observed. It is also very simple, very uncluttered and very effective.