Description of Heaven and Hell

“Mm. Heaven and hell aren’t a matter of altitude, of ‘up’ or ‘down’, you know.” “Then what are they?” “Well, for example, people can’t see infrared rays or hear really high-pitched sounds. You understand that, right, Kami-yan?” “Huh? Well, yeah.” “The whole ‘high’ and ‘low’ here is like that. It’s the high or low of the range that humans are able to sense. If it’s too high, then you can’t detect it. Same if it’s too low. Like, if God were right next to you, Kami-yan, you’d never be able to notice it.” Tsuchimikado grinned happily. “Incidentally, when we say low, we mean things like hell or demons. It’s the ultraviolet rays in comparison to infrared light, and low-frequency waves compared to high-frequency ones. They’re of opposite phases. They just have different wavelengths, but they’re all the same waves. So normally, if an angel were standing next to a demon, neither of them would realize it. They would have to interfere with the wavelength in between heaven and hell, or Earth.” “Tsuchimikado,” objected Kanzaki, astonished. It seemed like she didn’t appreciate the analogy to infrared and ultraviolet rays. “On the other hand, if you shoot infrared rays into an object, it’ll heat up, and if you shoot high-frequency waves at glass, it’ll smash all over the place, right? To put it really roughly, divine punishment and miracles and stuff correspond to that, nya. Heaven may not seem to the untrained eye to have any point of contact with Earth, but depending on the time and place, it can still have effects on Earth. Even the opposite is possible.” Kamijou still didn’t understand. Tsuchimikado continued further. “And so, Kami-yan, in religions that worship an idol like Buddhism or Christianity, the power of God or angels is actually pretty close at hand, ya know.”
(Toaru Majutsu no Index Volume 4, pg 31)

The heavens greatly opened up. That clear otherworldly and artificially arranged night sky of red, blue, yellow, and green split open. Like an old stocking ripping, large cracks appeared in places and they spread soundlessly. On the other side was a golden light. It was just like a legend. It was just like the world seen in religious art. That lowering curtain of light looked like a scene of the heavens and the earth being connected. Someone who did not know the circumstances would likely have mistaken it for an angel above the clouds about to spill out. In reality, god and the angels were not at a physical height. They were on the other side of some invisible phase like infrared rays or ultraviolet rays. However, that mistaken impression may not have been too far off in a way. That golden light was a massive amount of Telesma. Fiamma had not called in an angel. It may have been more accurate to say he had called in the world where angels were.
(Toaru Majutsu no Index Volume 22, pg 48)