"Le rien en or" (the nothing in gold)

I knew it had to be there, somewhere hidden in Zürich main station and today I found it. It's inlaid in the floor of the main hall (see the glowing square in the extra).
 
It's a piece of very special art, called "La Boule d'or centenaire" (the century golden ball) created by Dieter Meier's "Association des Maîtres de rien". The ball was installed in 2008 and will stay there for 100 years and aims to draw attention to nothingness and insignificance.
 
During that time, the ball will be taken out of its glass case on only a handful of occasions and rolled 12 meters (39ft) along a wooden runway known as the “Bois du voyage d’or”. The dates are as follows:
 
9 May 2008 (already happened)
24 June 2008 (already happened)
18 September 2016 (already happened)
28 August 2033
12 June 2064
21 July 2082
18 January 2097
9 May 2108
 
Some links to it:
In English, in German and on Youtube.