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Photographs impart information, that much is obvious - but it's the caption that guides us to understand what we are looking at.

Sometimes a picture contains various elements of interest; one of the things the web allows us to do is to overlay that information on the image itself. This is, of course, something the print media have been doing very successfully for many years.

We used this technique to report on the construction of one of the largest concrete arch bridges in the world, in the shadow of the Hoover Dam.

Personally, I think the photograph needs to be larger, and we'll work on that for the next one - but apart from that, it's a simple device that could be put to good use on many occasions.

The web offers many ways to annotate your own pictures, whether it's on a photo-sharing site like Flickr or by using a piece of software like .

What do you think of our approach? Do let me know.

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