Perhaps everyone knows about the Rubik's cube. This puzzle has long become something more than just a toy for millions of people around the world. The classic 3×3×3 cube changed the world—no less. Engineers create shape modes, complex tetrahedral and dodecahedral puzzles, a new extraordinary world of speedcubing has emerged, and rubicubism has become a full-fledged genre of modern art. For nearly 50 years, students and adults have been developing inventive problem-solving skills and mastering the basics of technical creativity using the Rubik's Cube. It helps form neural connections in the brain, as well as train artificial intelligence neural networks. This book was written by the inventor of the Rubik's Cube himself, the Hungarian sculptor and architecture teacher Ernyo Rubik. You will learn first-hand the history of the creation of the iconic puzzle, understand the phenomenon of its popularity and what hides the invisible 27th element in the heart of the cube. According to the author, this book is an attempt to understand the popularity of the Rubik's Cube over the years.