Actually, Niels Bohr believed that matter could exist as waves as well as particles - in essence, Quantum Theory. In telecommunications, we get light waves to behave like particles (DWDM - Dense Wavelength Division Multiplexing), so if there were a highly advanced civilization, they actually may be able to get matter to convert to waves.
Note:
Quantum Theory: A theory that addresses the duality of matter and energy, which have the properties of both particles and waves. In creating his atomic model, Bohr specifically applied Planck's idea that energy consists of discrete packets called quanta.
Anyway, kind of interesting.
An interesting bit of a puzzle piece cropped up on this post.
I've read well over 100 cases--maybe over 500.
This is the first time I've read where the individual SAW THE WINDOW liquify. Fascinating.
There have been a few cases where evidently some walls were not conducive to being traversed through. I don't recall what the common features were to those walls. My best guess is that a wall that is layers of different materials just isn't very workable or maybe not conveniently or easily workable.
I wonder, could those packets be made up of 'e', and a bit of space and a pinch of time (with time having three variable expressions and space having three variable expressions)? ... Oh, never mind.