You’ve probably heard of Erno Rubik. But most people don’t know that he created the Rubik’s Cube by accident. A professor of architecture, Rubik built a twistable box with colorful rows of labels on each side to see if it was possible to design blocks that could move without causing the entire structure to collapse. After Rubik rotated a few rows and mixed up the colors, his challenge began: Realign the hues. It took him about a month to restore the cube to its pristine condition.