I still don't see how this is relevant or interesting at all when it's simply coming up with an entirely theoretical substance that physically can not exist, and then saying it can do something that can't normally be done. Of course it can, because you've come up with some imaginary super-substance.
Where's the use?
It's honestly cheating if you just say it could be done if we just make up the idea that something can pass through itself.
water?
Water can't pass through itself.
Water molecules will stick together or bounce off.
If you shoot two streams of water from a water-pistol at each other, the streams collide. Water will splash off from the other water and whatnot, but no two molecules in those streams will pass through each other.
