Well, ignoring snazzy materials that take a pretty sophisticated factory like the original link, you could make something like this via a bunch of small full ra

Well, ignoring snazzy materials that take a pretty sophisticated factory like the original link, you could make something like this via a bunch of small full range drivers mounted in a ring and some of the dsp stuff available now. The computational requirements are low enough you could probably fit it onto a lot of maker style hobby controller boards too.