Google “rolling ball clock” to see several examples from historical periods. ... Reminds me of the Ball Bearing clock kit my brother got for Christmas back in the 60’s.

Based on the innovative rolling ball clock design created by Harley Mayenschein back in the 1970s, this awesome 3D-printed variation is yours to make at home, courtesy of free online instructions.

It's been rolling on for almost 14 years, but on Tuesday the plan will finally become a reality. The Whangārei Rolling Ball Clock will finally be lifted into place at the Town Basin in the ...

Simon Mehrtens, from Absolute Stainless, with Whangārei mayor Sheryl Mai and Hank Easterbroek from the About Time Trust "turning of the soil" for the About Time rolling ball clock project at the ...