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BI-BD-07 << previous pictureback to the gallerynext picture >> 
swallow
This unusual geometrical shape in the sky was created by a swallow that veered past the camera when the shutter button was released. Images like these are sometimes interpreted as proof of secret experimental aircraft. The circumstance that the authors of the pictures cannot remember having spotted anything unusual when the photo was taken, has added to the belief that these mysterious craft can fly at such speeds that they become invisible to the naked eye.

[© Wim VAN UTRECHT/CAELESTIA]