Espinosa unveiled his inspired solution: “The Steve Jobs Roll Your Own Calculator Construction Set.” It allowed the user to tweak and personalize the look of the calculator by changing the thickness of the lines, the size of the buttons, the shading, the background, and other attributes. Instead of just
laughing, Jobs plunged in and started to play around with the look to suit his tastes. After about ten minutes he got it the way he liked. His design, not surprisingly, was the one that shipped on the Mac and remained the standard for fifteen years.