In Avatar: The Last Airbender, Aang's eyes glow when he goes into the Avatar State. This seems to be the case with all Avatars, but Aang and the other airbending Avatars tattoos glow too.


Is there any reason for why airbending Avatars tattoos glow as well as their eyes?
Air Nomad tattoos glow when in the Avatar State because they follow chi lines in the body.

This has been stated by the Creators in DVD Comments of "Sozin's Comet, Part 4: Avatar Aang".
As they run along chi paths, the Air Nomad tattoos of an Avatar will glow when they enter the Avatar State.
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