If I were the architect of an oneiric house, I should hesitate between a three-story house and one with four. A three-story house, which is the simplest as regards essential height, has a cellar, a ground floor and an attic; while a four-story house puts a floor between the ground floor and the attic. One floor more, and our dreams become blurred. In the oneiric house, topoanalysis only knows how to count to three or four.
