abstract:Harri Sakari Vaalio (born 1956 in Järvelä, Kärkölä, Finland), also known by his artist name Wallu, is a Finnish cartoonist. He is known of his "Punaniska" (Finnish for "redneck") comic albums and his strips in Finnish magazines such as the "Mikrokivikausi" (Finnish for "computer stoneage") strip in the computer magazine MikroBitti.