This is perhaps one of my most-read stories. It was originally published on Pulp, in January 2006, under the title Circles. After its appearance in Spell, it was published in issue 4 of Fissure magazine in October 2008. Thanks also to my friend 'peaceful', for posting a link to the Pulp version on a crop circle internet forum, which no doubt attracted a fair number of readers who would otherwise not have encountered my work.
Link to download: http://darrenfrancis.brinkster.net/podcast3circulating.mp3
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Crop circle photograph courtesy of Peter Sorensen.