The Soap-bubble

The other days riddle was a bubble of soap on its way over the roof of the house. It is shot with my telelens. Thanks for the guesses – and the photos can now be seen at flickr. The riddle was two days ago. If you are intersted in visual illusions or negative afterimages, please […]

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A riddle

What is this? And what is the background? The answar follows April 2. (because tomorrow is red.)

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