Ørskov's studies at the Valand School of Fine Arts in Gothenburg, Sweden (1954–1960) were completed by stays in Paris, Greece and Italy at the end of the 1950s. During his years in Gothenburg, he taught and worked with ceramics. His early works such as Bymiljøand Gående are Abstract works depicting man in the city. He later began to use plastics including finished products such as pipes and funnels. His pneumatic sculptures consist of inflated pillow shapes and air-filled tubes as can be seen in Sommerskulptur (Summer Sculpture) from the mid-1960s.
Ørskov's works are not designed to be interpreted in terms of recognizable features but rather as an expression of contemporary art, free of any relationship with romantic notions of Naturalism or Mythology. One of his well-known dictums was "The sculpture's content is sculpture."
He explained his approach in books such as Aflæsninger af objekter og andre essays (Readings of objects and other essays, 1972) and Den åbne skulptur og udvendighedens æstetik (Open Sculpture and the Aesthetics of the Exterior, 1987). Later in life, he became preoccupied with Terrains Vagues, the largely unorganized, underdeveloped areas on the outskirts of built-up areas, typically with casual, temporary living quarters where he found traces of a primitive sculptural language.
Representerad: Nationalmuseum i Stockholm, Moderna Muséet i Stockholm, Göteborgs stads samling, Århus museum och Louisiana.
Offentlig utsmyckning: Skulptur 1967 på polishusets gård i Lund. Fasadskulptur 1968 Lundbygymnasiet Hjalmar Brantingsgatan Brämaregården Lundby.
De främre pjäserna känns inte helt olika Picassos från samma period.