Akiyuki Marble Run GBC Module
It might look like a roller coaster where balls are lifted to the top of the structure so that gravity can bring them shooting down the rails to the bottom, but Berthil van Beek’s marble-run GBC actually works in reverse. A pair of giant Lego flywheels spinning at over 1,000 RPM propel the small balls up the inclined tracks until they crest at the top and gravity takes over, bringing them back down to ground level.
