Joseph Kosuth, No Number #6 (On Color, Blue) (1991), neon tubing with argon gas and mercury. In the Chicago Museum of Contemporary Art's permanent collection: "I am only describing language, not explaining anything." (neon on wall, circa 1997, displayed at the Museum of Contemporary Art, Chicago; the original neon is blue) A succint definition of Conceptual art, in "Inquiry into the foundations of the concept 'art', as it has come to mean," given by Joseph Kosuth, requires "a linguistic rather than plastic context."