CAVERNA

                                                                                 
                                                                                 
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                 -----------.`  `....``  `.:+oooo-                               
                :///:::::-.` ``..........``  .:+oo:`                             
              `/oooo++ooo/  `.....-oso+/-...``  /ooo+-`                          
             .++/-..-.-oo+  `....+yhhhhhhys/..  -oooooo/-`                       
            `..-`.ooo+`/oo` `...-hhhhhdddhhy-.` `ooooooooo/`                     
           :+oo/`+oooo:`oo-  ....hhhhmmmmmdh+.`  +ooooooooo:                     
          -ooo+`/oooooo`:o:  ....yhhdmmmmmmdy..  /oo+:-.-/o+                     
          +oo+`:ooooooo/`++  `...shhdmmmmmmmd/.  -:.-:+/-.`.`                    
         -ooo.-ooooooooo.-o  `...shhdmmmmmmdo-`  ./oooo+----.                    
         +oo..oooo+/oooo+`+. `...ohhdmmmmdo-`  `/oooooo+-----`                   
        -oo+ +o+:.`.ooooo-.-  ...+hhdmmms-`  ./ooooooooo.----.                   
        +oo/ :.`.-.`ooooo+`-  .../hhmmmd/` `/ooooooooooo------                   
       -ooo/ .-----`oooooo:`  `../hhmmmd-  .oooooooooooo/.----`                  
      `+ooo:`------.:////++`  `..:hhmmmh.  :oooooooo+/oo/`----.                  
      -oooo:.---------------` `..-hhmmmy.  /oooooooo:`+.`------`                 
      +oooo-----------------`  ..-yhmmmo`  +oooooooo/ `.-------`                 
     -ooo+/-----------------.  ...yhmmm+` `ooooooooo+ ---------.                 
    `++/---------------------` `..syddh/  -oooooooooo`.---------`                
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The City of Palo Alto, in its official description of parking lot standards,
specifies the grade of wheelchair access ramps in terms of centimeters of
rise per foot of run. A compromise, I imagine...