The last time Google put a 'working' Doodle on the front page, it captured an entire generation (and trended on Twitter worldwide for days). For those that didn't see it, it was Pac-Man (and can still be played here!)
Goldberg was best known for his approach to unique gizmos that automated 'things' through a serious of unexpected steps. His style was so radical and thought-provoking that his name literally became part of the American vernacular. "Wow, that's a real Rube Goldberg set-up" , etc.
In this Google Doodle, tapping the arrow sets of a 'Goldberg-like' chain reaction that results in .... well you try it :)