The US flag, stripes and stars, has been having a similar design since the 18th century. But with the number of states changing all the time, the number of stars had to change too. And who says a different number of stars says a different arrangement, so that they all fit satisfyingly in the blue rectangle. With the addition of Alaska and Hawaii in early second half of the 20th century, there was a need for a 50-stars design. The designer of the winning arrangement, 9 lines of alternating 5 and 6 stars, is called Robert Heft and came up with it as part of a school project. He spent a weekend cutting and sewing his flat proposal, which was accepted as an official flag by congressman Walter Moeller and finally adopted in 1960.⁠