The big boomers of the show floor, island exhibits offer aisle access on all four sides, and are the most laissez-faire page in the show rulebook. They're seldom smaller than 20x20, and can go all the way to a whopping 250x300'. Yikes!
Islands are anything-goes territory, and can range from completely open to fully enclosed. They offer four chances for show visitors to find your booth and the biggest ones quickly become landmarks on the show floor. Industry leaders are rarely found exhibiting in anything other than island space.