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Seriously! I watched the entire thing without realizing this, thinking "Um... this is nice but I don't understand what is Vi Hart-ish about it?" Then I noticed the 360 aspect and mind blown.

The effect when watching it on your phone (with headphones) in the YouTube app is really neat, with the 3D audio and orientation tracking.

Ah, thanks for pointing this out. This helped a lot.

Am I understanding correctly that she only recorded a single video, and spliced it together 3 times?

Yes, if I'm understanding the making video correctly, it's three different time sections of the same video at once, timeshifted equally, with the three views also slowly rotating around the sphere (more like a cylinder) over time, which keeps the three edges seamless as long as you plan your movements carefully. And a bit of editing to correct issues.

> more like a cylinder

Or a "sphube," according to the making-of video.