Surfers' desire for the best possible waves to ride make them dependent on conditions that may change rapidly, given the unpredictable nature of weather events and their effect on the surface of the ocean. Because surfing was limited by the geographical necessity of an ocean coastline with beaches, the culture of beach life often influenced surfers and vice versa. "Surfer Magazine" was founded in the 1960s when surfing had gained popularity and was the initial voice for surf culture which included environmental activism. The staff used to say that if they were hard at work and someone yelled "Surf's up!" the office would suddenly empty. Localism or territorialism is a part of the development of surf culture in which individuals or groups of surfers claim certain key surfing spots as their own.