Fold It Once
Fold It Once is a physics-inspired interactive game about exponential growth. You start with a single 0.1 mm sheet of printer paper, then drag across it to fold — and every fold doubles the thickness. As the count climbs, on-screen milestones show what the stack now compares to: a bank card, a coffee cup, a person, the Burj Khalifa, the Kármán line, and eventually, at 42 folds, a stack that reaches past the Moon at 384,400 km. It turns a famous math thought experiment into a tactile, share-worthy moment, complete with a result card you can send to friends. Bilingual English and Chinese.
Created by haojie.huang
