From cubes to pyramids

These can be found on the flat roof of part of Crysal Palace National Sports Centre. No idea what they are.

Spent the whole day beside the pool there, getting hot, sweaty and drowsy, but it was all worth it as Chloe achieved her third Regional qualifying time- for 200m freestyle. She also got a good PB for 200 IM, and Joe swam a lovely 200 free for his first race long course.

Stupidly forgot spare batteries for camera, turned it on and it died. So all I have is this very bad pic I took with iPod before deciding I wouldn't bother blipping today.

What changed my mind?

Read yesterday's comments.