[Gunnr]

I think you're onto something with your pic Phoetux. Especially since the tools the left mud is holding are used to dig through the "earth". The middle pic with elements of "air"or gass which are things that exsists but cannot be seen. This may also describe ghost as well, since he seems to see them but no one else does.

Hm, so if we are to "use what we can't see" should we be focusing more on whats in the middle of this pic, where the mud is(supposedly) getting gassed or just seeing ghosts? Just a passing thought if we are going for a literal thing