It reflects the philosophy behind each bending style. The martial arts inspirations for the four elements are completely different, and their hand positions show that. Fire bending uses strong, explosive, direct movements inspired by Northern Shaolin. Closed fists represent aggression, power, and force being projected outward. Firebenders attack head on and generate energy from within. Earth bending is based on Hung Gar, which emphasizes rooted stances and solid impact. Earthbenders clench their fists because their style is about firmness, resistance, and overwhelming force. They meet attacks instead of avoiding them. Water bending comes from Tai Chi, which focuses on flow, redirection, and fluidity. Open palms allow smooth circular motions to guide energy instead of stopping it. Waterbenders adapt rather than overpower. Air bending is inspired by Ba Gua Zhang, a style built around evasion, spirals, and constant movement. Open hands symbolize freedom and non-aggression. Airbenders prefer deflecting and dodging over striking directly. So visually: Closed fists = force, control, confrontation. Open hands = flow, redirection, freedom. It’s also a subtle personality reflection of the nations themselves: Fire and Earth are more rigid and assertive. Water and Air are more adaptive and spiritual.