Residents and visitors to the town of Portal over the past several months have watched a work in progress as Deena Scarborough’s art students transform a plain wall into a piece of historical art. “They’ve been working on it for about a year,” said Larry Lanier, owner of Lanier’s IGA, the building serving as a canvas for the students’ mural depicting the town’s rich agricultural history. Scarborough, who has taught art in Portal for 15 years, said “I’ve had my eye on that wall for a long time.”