This post is part of Hard Refresh, a soothing weekly column where we try to cleanse your brain of whatever terrible thing you just witnessed on Twitter. You've heard of 3D, and even 4D, but prepare ...

If you spend a lot of time on YouTube, you may have seen something called 8D Audio showing up in the Up Next column or in your recommended videos. 8D? As in eight-dimensional audio? Yes, it’s a thing.