Constructed by incredibly talented LEGO builder jazlecraz, this is the LEGO Great Ball Contraption Showcase up for support on the LEGO Ideas website. For those of you unfamiliar with how the LEGO Ideas website works, if a set reaches 10,000 supporters LEGO will review it and consider the set for actual manufacture. Some details about the set from jazlecraz while I see how many marbles I can fit in my mouth before I swallow one:

Featuring numerous great ball contraption mechanisms in a closed circuit, the GBC showcase creates a fascinating display piece that celebrates LEGO engineering.

Each module highlights a unique GBC mechanism carefully selected to bring a scene to life. Watch as the balls wash along the sea floor, spiral up a power reactor, drift over the ocean waves, ascend an old windmill, paddle up a winding stream and scale the tower steps.

It looks like a really fun build with a lot of different engineering elements. Plus instead of just being a bare-bones great ball contraption, all the modules are cleverly decorated with different themes. How people are even able to design things like this is way over my head, like the ‘you must be this tall to ride’ sign on roller coasters when I was four. *tears welling up in eyes* But I don’t want to ride the stupid carousel again!

Keep going for a worthwhile demonstration and tour of the set, featuring a closeup of each individual module.