Ever lay out a banner or large format design on your computer, have it printed, then find out you can't read it from 100 feet away? What looks big to us indoors is often times lost in the vastness of the great outdoors. I recall doing a very large banner, I think it was 50 feet wide by 70 feet tall. It was just huge rolled up on the floor. When the crane lifted it and affixed it to the side of a 10 story building, it looked like a postage stamp. Here's some useful information if you are planning outdoor graphics and are not sure how big your letters need to be.