The famous Tube Map!
Even in the Tube’s early days, the map of all the lines and stations got a little messy! Then in 1931 the designer Harry Beck redrew it as a diagram, with straighter lines and moving the stations around to make it clearer. This way of drawing underground railway maps proved very popular, with many cities round the world copying the idea. The modern map of The Tube is almost the same 70 years later!