A fun compilation of auditory illusions, some of which we've covered on BB previously but are even more compelling when experienced one after another!
In this video, Mariano Tomatis shows how to create chocolate out of nothing. Here is his explanation of this wonderful phenomenon, known as a missing square or vanishing area puzzle. (Thanks, Ferdinando Buscema!)
Which way is the train going? Magic from just four frames! (It's a real train station so of course there is an actual answer, but that's no fun.) (via Neatorama)
A beautiful video of sound curiously affecting a stream of water, visible thanks to a camera recording at 24 frames-per-second. The speaker generates a 24 hz sine wave that vibrates the water while the camera recording at 24 fps make the stream appear to "freeze." (Thanks, Koshi!)
The old cups-and-balls "shell game" trick so effectively exploits the human brain's ability to be deceived that, even when the cups are see-through, you can still get played.