David Singer/The Almanac A “Knot Just Weeds” display of paper made from Japanese knotweed was featured during Art in Action, an annual interactive art show that was held at Washington Park Sunday. Albert Patone, of Pittsburgh, cooks the weeds with soap powder, places them in a blender with water, then soaks the mixture in a basin of water to form the papery substance.

David Singer/The Almanac Addison Abbas, 27, of Washington, displayed his glass work during the Art in Action event at Washington Park Sunday. Several artists showcased their work, which included photography and homemade paper. The event also included sand art, marble art and a balloon-making display for children.

David Singer/The Almanac Addison Abbas, 27, of Washington, displayed his glass work during the Art in Action event at Washington Park Sunday. Several artists showcased their work, which included photography and homemade paper. The event also included sand art, marble art and a balloon-making display for children.

David Singer/The Almanac Rebecca Kanar, a balloon artist, had a display during the Art in Action event at Washington Park Sunday.

David Singer/The Almanac Rebecca Kanar, a balloon artist, had a display during the Art in Action event at Washington Park Sunday.