Unfortunately they were waves of nausea. Warning to regular readers: this post is entirely off-topic. Many apologies.
But they were the only waves around as I struggled to Paddington on Sunday morning with a strenuous hangover, to get the train with Claire and her friends. Who organises a birthday walk the morning after a boozy birthday dinner? Yes. Claire Bennett.
But it was worth it, for the charming walk from Henley on Thames to Shiplake, via lots of fields and a nice pub, in the company of several of her friends. Though even a charming walk can feel like a forced march when you've got a hangover.