claybird, that one may take a while to answer, but let me try to briefly clarify.
We live in "air" and everything that is under water can be considered another dimension to some degree.
Imagine if you took the water/air interface, and and made it vertical, as opposed to horizontal. Then, if you could stand there, and reach through (from the air into the water) and grab things, and pull them over to the air side...
Does anyone know what I mean?
