I may not have gone where I intended to go, but I think I have ended up where I needed to be.
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Don't Panic!
This is a very simple and straightforward cache. You are absolutely NOT being asked to find the answer to the ultimate questions of life, the universe and where to get the best coffee.
Soak up the sunshine and salt air and look at the boats. This will calm the mind. You will note that they are floating on the water in much the same way that lead balloons don't. You might even be lucky enough to spot a whale. However, it's infinitely improbable that it will ever have any kind of interaction with a bowl of petunias.
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But enough babble - you're here for the cache! Watch out for Vogongs and Muggles. It's a busy area and ultra discretion is needed, please.
Space might be big, really big, but this cache isn't - though after, mugglement, the original nano has been replaced by a micro.
Look for a tastefully camo'd magnetic mint tin about half a metre from the earlier placement.
Ignore all that... by some celestial tomfoolery, the original nano is back, in its original postition, and the replacement tastefully camo'd magnetic mint tin seems to have promptly vanished in a puff of logic!