[Avodah] Unifying Rules

[Rich, Joel]

R' HS gave an interesting shiur last night on halacha's view of
perception versus reality. 
Some examples were the squareness of tfillin, the kashrut of letters in
a sefer torah,worms in fish (kosher if "internal"),tzurat hapetach,
enzymes from stomach lining, sunrise sunset rally based on sea
level.....
His last statement was that there is no underlying rule as to whether
halacha looks to  perception or  reality and that each case must be
evaluated separately.
Of course I was hoping for a meta answer (my yeshiva training was to
always look for the unified field theory).  Anyone ever see anything on
this?
KT
Joel Rich
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