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Published on Mar 6, 2011
Steve Worley invented this in our (entirely unmodified) private multiplayer world. The basic mechanism of stairs, signs, and glass cubes is shown in the middle of the video, starting at 1:16. I can't say I fully understand it, but the main idea is that creatures are pushed along to the next set of steps and then pulled into that step's water blocks, which pushes them further on in turn.
From my experiments, this same mechanism is not able to push blocks, feathers, or similar along, just creatures. The blocks get caught at the bottom of the steps. So, this won't work as a mob grinder output transport mechanism. But who cares? It's hilarious to see a bunch of creatures caught in the flow, going round and round, skeletons shooting at me as they go by. The spawner overhead provides shade so that the monsters don't get a sunburn.