With his most recent show, “New Oils,” Jason Martin introduced a new chapter in his investigation of the fundamentals of painting. The artist, who divides his time between London and Lisbon, received worldwide attention with his participation in the 1997 exhibition “Sensation: Young British Artists from the Saatchi Collection” at the Royal Academy of Arts in London. He is known for monochrome paintings on aluminum, stainless steel, or Plexiglas grounds, in which dense and expressive brushstrokes project outward, creating dynamic tension. In his recent works, Martin has applied the paint, which