Skateboarding is an action sport originating in the United States that involves riding and performing tricks using a skateboard, as well as a recreational activity, an art form, an entertainment industry job, and a method of transportation. Skateboarding has been shaped and influenced by many skateboarders throughout the years. A 2009 report found that the skateboarding market is worth an estimated $4.8 billion in annual revenue, with 11.08 million active skateboarders in the world. In 2016, it was announced that skateboarding would be represented at the 2020 Summer Olympics in Tokyo, for both male and female teams. Since the 1970s, skateparks have been constructed specifically for use by skateboarders, freestyle BMXers, aggressive skaters, and more recently, scooters. However, skateboarding has become controversial in areas in which the activity, although illegal, has damaged curbs, stoneworks, steps, benches, plazas, and parks. History 1940s–1960s The first skateboards started with wooden boxes, or boards, with roller skate wheels attached to the bottom. Crate scooters preceded skateboards, having a wooden crate attached to the nose (front of the board), which formed rudimentary handlebars. The boxes turned into planks, similar to the skateboard decks of today. Skateboarding, as it exists today, was probably born sometime in the late 1940s, or early 1950s, when surfers in California wanted something to do when the waves were flat. This was called "sidewalk surfing" – a new wave of surfing on the sidewalk as the sport of surfing became highly popular. No one knows who made the first board; it seems that several people came up with similar ideas at around the same time. The first manufactured skateboards were ordered by a Los Angeles, California surf shop, meant to be used by surfers in their downtime. The shop owner, Bill Richard, made a deal with the Chicago Roller Skate Company to produce sets of skate wheels, which they attached to square wooden boards. Accordingly, skateboarding was originally denoted "sidewalk surfing" and early skaters emulated surfing style and maneuvers, and performed barefoot. By the 1960s a small number of surfing manufacturers in Southern California such as Jack's, Kips', Hobie, Bing's and Makaha started building skateboards that resembled small surfboards, and assembled teams to promote their products. One of the earliest Skateboard exhibitions was sponsored by Makaha's founder, Larry Stevenson, in 1963 and held at the Pier Avenue Junior High School in Hermosa Beach, California. Some of these same teams of skateboarders