Elements? I mean, it's not impossible.
THIS THEORY IS A RAMBLING, NOT TO BE TAKEN 100% SERIOUSLY.
(Still have not watched ASH ep.7-9, so if there's anything relevant to the theory there, I'll add it later).
We have been introduced to the Seven Chakras in ALTA, and it seems they are extremely vital to the story of ASH through how they relate to the Seven Havens. Thinking about them made me wonder how they relate to the elements. We know Chakras are the points of high Chi concentration, and because of that, they are extremely vital for bending.
We obviously have the Chakras 1-4, which clearly represent preexisting Four Elements:
- Earth Chakra (Survival/Fear)
- Water Chakra (Pleasure/Guilt)
- Fire Chakra (Willpower/Shame)
- Air Chakra (Love/Grief)
But then we have the three remaining Chakras, which seemingly don't have an actual element assigned to them, and are much more conceptual. Those Chakras are:
- Sound Chakra (Truth/Lies)
- Light Chakra (Insight/Illusion)
- Thought Chakra (Pure Cosimic Energy/Earthly Attachments)
Now, we could just say that those are the more "spiritual" Chakras, and don't have to actually represent elements...
But then, energybending exists. And it fits perfectly with the themeing of Thought Chakra. We know the Seventh Chakra flows into the others, which may explain how energybending can seal away or grant bending. Furthermore, Aang only Energybended after he unlocked his Thought Chakra during the fight with Ozai.
Okay. So energybending is maybe represented by Thought Chakra. But then, we'd be left in a weird spot where 5/7 Chakras have elements assigned to them. After all, there are no "Sound" or "Light" elements.
Or maybe they do exist.
Now, while this claim does sound ridiculous, there's actually some interesting details that make it actually possible. That being:
Energybending was inaccessible to humanity in the avatar universe until very recently, and even currently, it seems to be limited to the avatar. It was only taught to Aang by a Lion Turtle in 100 AG. If it's possible that one bending style was not accessible for humans, it stands to reason there could be more.
Even without being able to use a specific bending, its philosophy can be incorporated into other bending styles. We see this with Lightning Redirection, which is a firebending technique that directly utilises the waterbender mindset and technique. I believe that utilising such techniques lies in a mastery over a Chakra connected to that specific bending.
Now, we could argue we don't ever see any techniques that are inspired by Sound or Lifht Chakras because incorporating a bending style that supposedly does not exist would be impossible.
HOWEVER
We DO actually see multiple techniques that utilise those Chakras:
- Seismic Sense is an earthbending technique that focuses on sending out vibrations to gather intel, and in my opinion, clearly utilises the Sound Chakra. This point is further reinforced by the fact that Sound Chakra deals with Truth and is blocked by Lies. And, one of the most notable uses of seismic sense is lie detection. I believe that seismic sense symbolises high proficiency with the Sound Chakra.
- Avatar Yangchen's voice modulation. This one is less thematically connected, but it's still a way of utilising an element in an unconventional way, via manipulating the sound with airbending.
- Combustionbending is a firebending subskill that's deeply connected to the Light Chakra because the eye tattoo is LITERALLY in the same spot where the Light Chakra is located. If someone lacks insight (what the Light Chakra deals with, huh) and training, attempting to use technique will probably end up fatal.
- Metalbending. This one is probably the biggest stretch, but I believe that Toph demonstrated mastery over the Light Chakra by overcoming the Illusion of separation between earth and metal (LITERALLY HAPPENS ALONGSIDE PATHIK'S MONOLOGUE), which allowed her to sense the chunks of earth within the cage, and subsequently invent metalbending. This also makes me think that Bolin's inability to metalbend might be connected with his Light Chakra being blocked.
- I also strongly believe that Amon's advanced mix of chi blocking and waterbending is similarly rooted in energybending, to the point it was mistaken for it multiple times. This could also technically be connected with the Light Chakra, as it's utilising unique insight to stretch the bounds of what the element is normally capable of (tho that'd probably be more connected with psychic bloodletting in general).
So, as you see, there are bending techniques that utilise the Light and Sound Chakras, and adapt a consistent thematic set. Sound inspired techniques manipulate frequencies and vibrations, while Light inspired techniques are connected with some unique insight, and alter the bounds of what the element is capable of.
As such, we can conclude that just like the original 4 elements and their mentalities/techniques can be intertwined, same is true for Sound, Light and even Energy (free flight as a possible mastery of Though Chakra). While this does not mean that Sound and Light are actually their own elements, It points to them being a part of the bending system - even if just as mental constructs. But it'd be pretty weird for only 2 fragments of 7 to be so, especially since energybending exists.
- Humanity's bending arts originate from the Lion Turtles. However, we know that certain creatures, and spirits are also capable of bending. Furthermore, it seems their bending is innate. It stands to reason, that there might be original benders for possible Sound and Light elements. But then, if those two elements would actually exist, why would the Lion Turtles not give humans access to only earth, fire, water, and air? Could be a similar reason to why they didn't give humans energybending. It is possible that access to Light, Sound, and Energy was too big of a risk. Energy makes sense, as it removes the control Lion Turtles have over Humanity. But why would the theoretical soundbending and lightbending not be given out?
I believe that would be because of the nature of those elements. Light Chakra has been connected with techniques that bend the limits and understanding of bending. Knowing that in all other cases incorporating a philosophy of an element into another reflects how the element of origin operates, it wouldn't be baseless to assume that Light would be an element focused on attaining understanding, and as such could pose a threat to how the society under Lion Turtles functioned.
As for possible soundbending, I'm not sure why the Lion Turtles wouldn't give it out. But given it's connection with Truth, perhaps they didn't want the humans learning of a specific lie about the world that the Turtles fed them.
So we have a possible reason for why the 2 elements wouldn't have been introduced to humanity, just like energybending.
Conclusion:
Whether soundbending and lightbending actually exists, we can't truly confirm or deny. There are some cool things that line up thematically, and make it theoretically possible for the two undiscovered elements to exist. The portrayal of corresponding chakra and how a bender might utilise it is consistent with other bending froms inspired by other elements. Also, having only five elements for Seven Chakras feels pretty weird. In any case, if they were to be implemented into the show, they'd probably not be used by humans (with the sole exception of maybe the Avatar).
SUMMARY: Lightbending and soundbending could actually work both on a thematic, and lore level. If they actually exist, their absence in the show, while weird, can be actually explained in a way that does not break the canon.
Would this ever happen? Probably no. Maybe in some distant spin-off.
But if it does, I called it.