The "secret" setting that lets After Effects show a layer surrounded by particles.
Here's a quick tutorial debunking the myth that After Effect's CC Particle World cannot be used to put particles infront of and behind a layer. It absoltely can and you don't need separate layers to do it.
[Edit: Yeah, I know I've changed the name, but my wife hated it and the joke was starting to get old. Plus this brings these videos inline with my other two series, Makin' and Startin']