Rainbow Wave GBC (v2)




Great Ball Contraption Rainbow Wave designed by me. It has 38 Lego colors and about 1150 moving parts. It is powered by a single motor, with each of the colored pistons sitting on an 8-tooth gear. Each piston’s gear is exactly 1 tooth offset from its neighbors making one wave 8 colors. The GBC is level so the balls are moved by the waving surface. The initial digital model and building instruction was created by Laurent Fournier (Courbet).

Current building instruction is version 2 with 4 extra power repeaters to prevent too much friction.
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Name Rainbow Wave GBC (v2)
Designer Berthil
Designed 2017
Inventory 1990
Theme Technic


  • 4 days, 14 hours ago bkow Level 8
    This is very awsome. Thank you for your work and for sharing this to us!
  • 6 months ago Mocdaddy12115 Level 11 MOC Designer
    Your detail in design is amazing.  Thanks for sharing.
  • 8 months ago LegoOri Level 29 MOC Designer PRO
    This is not only beautiful and inspired - it is also a great demonstration of the physical phenomenon of waves: in that the balls stay at the same height but gain lateral motion while the colors (the medium of the wave) only move up and down.
    The first GBC I found to have a point - thank you!
  • 2 years, 8 months ago antares Level 21
    Wow, very creative and inspired!

    Excellent Idea and also for understood Mechanical, Gear, building Waves (like Grafical Audio-Samples) and enyoing nice Ccolor-Animation.

  • 2 years, 10 months ago psmyth Level 15
    really like this moc...very creative...well done!!
  • 2 years, 10 months ago FernandoQ Level 16
    Fantastic job. I have already built it, but thanks to Berthil for the design and Courbet for the instructions.
  • 2 years, 10 months ago jncraton Level 20 MOC Designer
    That's beautiful! Fantastic job on this build!
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