One of the Powerhouse Museum's longest-term attractions is a version of the Strasburg Clock built in Sydney. It does its thing on the hour throughout the day, and always gathers a crowd. This photo was taken during the procession of the Apostles, at the point when Peter was there - because the cock is crowing three times, and the devil's window is open.
More about it here.
Such things fascinate me for the mind behind them, that said, hey, I'll build one of THOSE - and does. Amazing intricacy - the clock has so many features. It must have been an engrossing challenge. It is all too easy to be deterred, to think yourself out of something being possible rather than just going ahead and seeing if maybe it is... and sometimes things don't work. But sometimes they do.