Board Thread:Naruto Discussions/@comment-26403664-20160228225013/@comment-27660682-20160303041249

That makes more sense but I wouldnt rule out the other definition given the hype about the weapons. Remember that KCM naruto's cloak is also ethereal to a degree as kakashi and guy passed through it but in other circumstances the cloak was solid to block chidori. Also, even susanoo is ethereal to a degree, the user and objects such as sand and fireballs were able to pass through it from the inside, although it maybe because susanooo is mainly ethereal to its user and chakra. It probably works similar to how an object can pass through a wall if all the atoms in the wall and object are resonating in the same harmony.