Cylinder II, Leo Villareal

I spent an hour this afternoon enthralled at the Hayward Gallery's Light Show, which was like a magical playground. (Although I still don't think it will prove as memorable as the beautiful Dan Flavin exhibition at the Serpentine some years ago.)
It ends spectacularly in Ólafur Elíasson's timeless garden of 27 fountains, with droplets of water playing and jumping like liquid diamonds. It is impossible to describe, so disorientating that you feel you might pass out - and utterly beautiful.