Sure I can. With my eyes closed, I'm about four inches back and
   an inch down behind my eyes from my best determinations.

   Now if I was born and was not coddled properly, I might know
   have had a social mirror with which to be able to see myself,
   that's true.

   But it's hypothetical; babies treated in that way, died. It's
   incompatible with life to not have initial social interaction.

   But once we're beyond the age of 4 or so, better if longer, we
   can easily close our eyes and know ourselves; because we have
   more than enough "other selves" to compare our "selves" with.

   And when you're an adult? You could have your head in a jar and
   do fine without much additional inputs, unless you lost your
   memory. Then you'd be screwed.