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I'd suggest looking through the videos on akiyuki's channel. It's a gold mine of novel Lego contraptions and isn't limited to GBCs, although it is majorly that.

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The undisputed king of GBC. His modules are works of art. So many incredibly intricate and innovated mechanisms with lots of precisely coordinated parts, yet driven from a single standard Lego motor. And the videos are well-shot, clear and to the point.

Some favorites:

- Catch and spin robots: https://www.youtube.com/watch?v=lXF7mgZ9mzk

- Basketball shooter: https://www.youtube.com/watch?v=Yud9ukF5cV8

- Pole dancing quartet (SFW): https://www.youtube.com/watch?v=6s0a7Z70WxM

It is amazing how much is added by the eyeballs. Imagining it without would seem somehow lifeless in comparison.

It's truly a gem of a channel ! This clock was particularly mesmerizing : https://youtu.be/GUdlSYC1cCE

The railway system series is also great, you'll see the step by step construction of the system and later on its use in a GBC event.

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