The purpose of the sentence 7 proviso
"Nor is it any mystery why the Park Service decided to allow non-stationary protests within the center zone, even though such protests will admittedly obscure some of the White House view. Assuming arguendo that a ban on non-stationary protests would have been constitutional, the effect of instituting such a ban would be to demarcate a "no man's land" in the middle of the sidewalk. Protestors on either side of the zone would have considerable difficulty communicating with one another, for they would be prohibited from carrying their signs across the demarcated area. The regulation the Park Service adopted represents a reasonable effort to accommodate the needs of such protestors."
