The sidewalk outside my building was recently redone by the city. They poured like a 50-foot long slab and then they cut "lines" in it to make it look like individual 5-foot sections. The lines don't go all the way through; they are only about 1/4" deep. Why do they do that? Just for aesthetic reasons? Sounds like a waste of manpower to me. What's wrong with a 50-foot slab of concrete that looks like a 50-foot slab of concrete? Confusing concrete construction is confusing.