They come and go and
it is difficult to predict
where exactly they will appear
next. Perhaps the best idea is to come prepared
The installation is by the Danish artist Jeppe Hein. It first appeared on the site in 1951 during the Festival Of Britain - which was close to a decade before I was born. It looked like so much fun that it made me wish I was at least thirty-five years younger than I am.
That's my trouble - always too late or too early.
It will be there until the 16th September and is open from 10am until 10pm. Fun in the dark too, I expect.