A 350-foot row of flax is growing in Maja Park along the Ben Franklin Parkway near Eakins Oval. The crop row is part of a temporary art installation commissioned by the Association for Public Art. “At present, we are like separate filaments of flax before thread is formed,” Franklin wrote in his pamphlet “Plain Truth.” At the west end of the row is a wall Richards built out of concrete blocks made with parts of the flax plant. Similar to hempcrete, which is made from woody parts of the hemp plant, flaxcrete is much lighter than traditional concrete.