What's This? Part Two

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.