The Joker Could Cut a Bat Signal Out of Wood

I use a jigw in ninth grade to cut a bat signal out of wood. The point is, sometimes light only signals to transmit, a one or zero over a long distance. I just don't think that light beakon signals are the best way to communicate. You have to have coted information, and you have to authenticate that the message came from a certain sender. That's the ke here. And then a d then bat man would die from it.