The Facemath meme, often referred to as 'Face Math' or 'Person A + Person B,' is a popular visual format used to highlight uncanny resemblances between different people. The logic of the meme is simple: it presents two individuals as the 'ingredients' that, when combined, result in a third person who shares their distinct facial features. While versions of this joke have existed since the early days of Tumblr and Twitter, it became a staple of internet culture for pointing out celebrity doppelgängers or creating satirical genetic theories. It serves as a humorous way to analyze human aesthetics, suggesting that some faces are simply the mathematical sum of others.