Not surprised, I bet the animators paid close attention to how his eyes would reflect his environment and adapt to emotions like a normal person's eyes would.>> also he's the avatar and his elements are constantly changing, so his eyes could too
I never caught that! -So well written- Now that I'm older and rewatching it, I can see so many awesome little details. Such as Katara's bloodbending--balancing dark and light. Zuko--dark side and light side (literally--as seen with the scar on his face).