This meme originates from the iconic opening narration of the animated series 'Avatar: The Last Airbender,' where the protagonist Katara explains the balance between the four elemental nations. While the original sequence is a serious setup for an epic fantasy story, the internet has repurposed the four-panel layout to categorize everything from different personality types to unexpected brand rivalries. The humor usually lies in the final panel, where 'Air' is replaced by a contradictory or absurd fourth element that disrupts the 'harmony' of the sequence. Since its rise on platforms like Reddit and Tumblr, it has become a go-to format for highlighting groups of four or making jokes about how 'everything changed when the fire nation attacked.'