permitted an electronic sign to be illuminated by light shining
onto it, but the real revolution occurred when light bulbs were
used to form images and words. Light bulbs flashing on and off made
new demands on the attention of passersby. Light bulbs blinking
in sequence could also simulate movement. Add this property to the
mix, and a dramatic transformation of American streets resulted.
As soon as the sun goes down the electronic sign pops on. Many of
these have special sensor features that automatically turn themselves
on. Wow Thomas Edison would be impressed today. Every fast food
restaurant has an outside electronic sign. Many of them even illuminate
their menu boards for clarity.