Fifth, researchers (as in many other areas) appear to have paid little attention to the possibility of significant curvilinear relations between variables. Building height is linear, but the psychological and behavioral effects of that most linear variable may not themselves be linear. For example, residents of the highest floors may feel somehow superior, or have the best views: they often pay the most for their residence. Those at ground level may value the easy access to streets. Those in the middle may feel they have neither advantage, but are merely squeezed between two more advantaged groups. Perhaps an analysis of unit prices by floor, done across numerous buildings, would confirm or disconfirm these speculations