The Clock of Marbles
From Perplex City Wiki
- The Clock of Marbles was set up many years ago and stretches for several hundred metres through various parts of the Academy.
- Only a handful of senior Academy staff are old enough to have been taught how to tell the time by observing the speed, interval and distinct pattern of the black and white balls as they emerge and disappear though holes in the wall. T
- They've so far refused to divulge their methods and it is feared the secret will die with them unless a younger Acadamist can crack the code.