What makes a person beautiful has fascinated artists and scientists for centuries. Beauty is not, as it is often assumed to be, “in the eye of the beholder” – but follows certain predictable rules. Symmetry and proportions play a role, and though culture and norms shape our perception of beauty, researchers observe a consistently striking agreement among people on whom they regard as beautiful. Not surprisingly the beauty market has been on a steady rise (besides a minor 2020 Covid slump), reaching $430 billion in revenue in 2023, according to a recent McKinsey report. The fascination for the …