Lafalot Angel on Instagram: "It is the dash mounted glass prism, called the traffic light viewer. Even if you don't have a sun shade installed, in many cars from the 40's and 50's it was a necessary accessory. It’s always a conversational piece when I see people look at the prism and try to figure out its purpose. Back in the day and still in some small communities a traffic control light was installed by placing two poles diagonally across from each other on the street corners. Then the folks s