After 30 days of continuously changing its logo, the tech giant unveiled its final new design at midnight Thursday. “We wanted there to be a mathematical consistency to the logo, really pulling it together into one coherent mark,” CEO Marissa Mayer said. Mayer said she spent the majority of a Saturday and Sunday crafting the logo from start to finish with three designers and an intern. “Our last move was to tilt the exclamation point by 9 degrees, just to add a bit of whimsy,” she said.