The main tower of Ball Rolling Machine 20, the LEGO Great Ball Contraption by Japanese designer Rimo Yaona, will drive you nuts.

This huge ball machine features an incredible mechanism: 24 panels slide from left to right in perfect harmony to push your favourite basketballs and footballs to the top of the GBC module.

The movements of the sliding blocks in a beautiful lime colour form a vertical wave that will catch your sight and fascinate your friends and children.

This LEGO ball machine is also equipped with a stepper and a very clever and innovative ball feeding mechanism.

I let you discover this wonderful construction on Planet GBC or on the Rimo Yaona channel.

You can now integrate this huge creative construction in your GBC circuit thanks to ready-to-build LEGO kits available on BuildaMOC.

Amazing!