Gottlob Frege: "In the process though, he produced something very important for modern logic. He said something like, you can say a group of things are similar, but you can also say why they're all different. For me this is also like in abstract art. You can have similar forms but even if you look at them, you can never see the same form all the time. You can see it's a grid, but you can always look at one unit and then maybe the next one looks a bit different."