Belfast psych-rockers Exmagician's songs rolling like coloured clouds over a sweltering tentload of bewildered lunchtime drinkers.
I also saw a greater variety of lizards and geckos than I ever imagined existed and butterflies flying en masse, like delicately coloured clouds lighting up the sky in creamy white, cornflower blue and lemon yellow.
But you can escape all this in your hotel room, which is tranquil and silent, with a beige-coloured cloud-bed facing a wall of plasma screens.
Twenty people remain in the hotel, as rust-coloured clouds roll in and the sun disappears.
The slow-moving river surface reflects the blue sky and the patches of white and gunmetal-coloured clouds passing overhead.
If I squint a bit and ignore the bruise-coloured clouds rolling in from Dartmoor, I could be in Saint-Tropez or the Caribbean.
In Rain, Steam and Speed, painted in 1844, Turner showed a railway steam engine enveloped in a vortex of its own smoke that swirled into multi-coloured clouds filling the sky.
According to The Field, "the weather was not the most agreeable for a boat-race... a raw wind... leaden-coloured clouds overhanging the river".
I'm in the yard, staring up at the concrete-coloured clouds, when my last name and prison number erupt from the loudspeaker atop the wall, announcing I have a visitor.
Despite the flint-coloured clouds hanging over London's nightlife at present, there are reasons to be cheerful: there have been a load of great clubs opening recently, with late licenses, impressive sound-systems and consistently inventive line-ups, just slightly further afield than what we're used to.
