This paper examines the search for spirituality of Belgian avant-garde artist Paul Joostens (1889-1960). Although known as a pioneer of Dadaism and (abstract) avant-garde art in Antwerp and Belgium during the tens and twenties of the past century, his later artwork, based on Medieval and mystical inspirations, is often neglected or misinterpret. Joostens was tired of always coming after the true revolutionary Parisian avant-garde artists. His ambition was to transcend this form of avant-garde in search for something more durable and personal, more spiritualized. His 'impure' artwork, as he called it himself, is the artistic legacy of a unique Gothic Dadaist.