I don't know what I did LOL all I know is that I had shield surrounding the open edges of the sim and I used wind a lot (maybe/probably with pressure off and veloc on). Other than that I have no clue or idea what this is, I'm using the latest git source. But still it's really cool :P especially when random things just get pulled in and disappear! I don't know if this has something to do with the the new gravity grid or some pressure grid bug but it seems like it, but I still like how it looks like a real '(black)hole' in the tpt universe lol.