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Crop circles carry a message if the right instrument can be found to play back the message. Perhaps

The message I think is that there are people who have worked out designs and how to produce them on the ground - after which microlight pilots with cameras can take superb photographs, which they can -and good luck to them! - sell to publishers of calendars etc.

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Imagine you come across a ceramic cylinder with weird wavy lines all around it

At least it would last a bit longer than a few weeks leading up to harvest time.

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Intricate crop circles are a mystery such to be examined for the message.

Can you refer to even one such message? One, that is, that has been independently shown to be whatever the first person thought it was and published his/her version of the message?

Susan