Here is something else to see on your upcoming visit to London. Danish artist Jeppe Hein has created a site-specific installation for The Curve at The Barbican.
The piece is called ‘Distance’ and you can see it working here.
Visitors trigger the rolling balls by entering the space, so the experience varies depending on how busy it is. If you can visit when it is quiet you will be able to follow your own ball from start to finish. Good fun.