Nifty things

Nifty things

We will present such “nifty things” here in no particular order. 
Perhaps we will end up recreating and testing one or two of them. Of course, we will also publish this as a tutorial, provided that no third-party rights are infringed.
Now, without further ado, ... “nifty things”

4th-Order Equatorial Ambisonic Microphone Array

Yes, you're right! It's a fourth order of an ambisonic microphone array.
We were shocked when we saw this for the first time, too.
See for yourself in this article.