Here is a gorgeous rolling ball sculpture that puts on a trippy show as you let it run. This copper wire rolling ball sculpture from Copper Gravity comes with 5 stainless steel balls, an electric motor, and a link arm mechanism to lift the balls. According to the artist, these took over 200 hours to build.
This rolling ball sculpture measures 520 x 440 x 370mm. You can find out more about it on Etsy.