The Rolling Ball Clock in Whangārei is pretty special. Poor photo I'm afraid and I only had a moment to watch it work.

Balls are released onto a wire track at precise intervals to accumulate in spots that tell the time.

The sculpture features spirals, a Newton’s cradle, racing balls, an undulating track, a loop-the-loop, banked corners, a sawtooth track, and switches.

A huge glass case containing metal tracks, laid out in loops and spirals, along which large balls roll.