The potato seems like a Romantic (organic) object.... you can watch it growing if you don't eat it. It is going to change – grow, rot, disappear. A pebble is like a Classical thing – it changes little if any... If it was big you could keep the dead down with it.... The Classical idea is not around much anymore. [Der Koning is comparing the Potatoes of Vincent Van Gogh to the Pebbles of Jean Arp.