Heidegger continues, saying that a work of art is not a simple thing (as a doorknob or a shoe is, which do not normally involve aesthetic experience), but it cannot escape its "thingly character," that is, being part of the larger order of things in the world, apart from all aesthetic experience. The synthesis of thingly and artistic is found in the work's allegorical and symbolic character, "but this one element in a work that manifests another, this one element that joins another, is the thingly feature in the art work". At this point, however, Heidegger raises the doubt of "whether the work is at bottom something else and not a thing at all." Later he tries to break down the metaphysical opposition between form and matter, and the whole other set of dualisms which include: rational and irrational, logical and illogical/alogical, and subject and object. Neither of these concepts is independent of the other, yet neither can be reduced to the other: Heidegger suggests we have to look beyond both.