Austin Carr profiles Square’s internal design culture and their desire to design things like receipts, points of sale, and refund screens with a bit of fun and whimsicalness. And it’s true: just Tuesday I bought a cup of coffee at a local coffee shop which uses Square on an iPad as their point of sale. I used my finger to sign my name in the giant signature box and then thought to myself,“that was fun.” (Though not as fun as drinking the cup of coffee.)