The expanding brain meme began as a four panel image format that spread online in 2017, showing a brain glowing brighter as ideas get more extreme. The galaxy brain label became shorthand for the final, most enlightened stage, even when the idea was intentionally ridiculous. Short video edits later paired the format with rising sounds, and sped up versions became popular for fast paced reveals on social media. It remains widely used because the contrast between tiny ideas and cosmic presentation is instantly readable.