Do walls=blocking terrain? or does blocking include walls but walls are not blocking terrain per se?

@Kurokatana: While walls are considered to be blocking terrain, they are a specific type. Nobody needs to be adjacent to wall to prevent LoF, either printed or created by a game effect (ex. JSA Green Lantern, Sandman, etc.).

@spider_ham: But are "printed walls" and "printed blocking terrain" the same thing? If a character ignores blocking terrain (inside and outside) on movement, would it be able to go through walls?

While all walls are blocking terrain, all blocking terrain is not walls. His ability specifically needs darks bordered lines to activate, not squares of brown terrain.