Yaoyao Nude in a Chair

 I have often found myself wondering why chairs have a flat seat more often than not. Once in a blue moon I am lucky enough to sit down in a chair that has two cheek grooves carved into it, but that is hardly the standard. And why is that? Why do we torture ourselves by sitting down on a flat surface? I do not know about the rest of the population, but my rump goes numb after about five minutes. Then I find myself rocking side to side like some demonic child in a horror movie. Sometimes it is so bad I have to stand back up, which totally defeats the purpose of using the chair to begin with. How much harder can it be to scoop a couple shallow grooves out of a chair as opposed to keeping it flat? I doubt it eats into their profit margin by that much more. I think the only chairs I know of that come with the butt fittings are made by the Amish. That surprises me because I have never pegged them as people who would pay close attention to matters concerning comfort. 

_{Photo Credit: Agustin Escámez}