Congratulations to Lisa Perrett on providing the correct answer to Friday's puzzle (see previous post). To others who've attempted to solve it, it's nothing to do with Magic Eye posters... :-)

Some clues: the picture - I've posted it again below - is called a QR code, and you'll need a smartphone to decode it. Again, if you can work out what it says, please contact me at D.Renfree@ucb.ac.uk - otherwise, an answer and explanation will be provided later this week.

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