|Observation: detecting characteristics and behavior of objects by whatsoever contact with the object unlike conclusions from past processes or assumeded or imperceptible parts or hidden parameters. See also hidden variable, observation language, theories.|
Books on Amazon
Observability / Maxwell: Thesis: there is nothing in principle unobservable, because I could have had electrons eyes can (in a possible world) - FraassenVsMaxwell: that is just a trick - shift of the topic: if I were a giant, I would ... - Physics describes ulitmate observation limits - N.B.: these are human limitations. - "observable" / Maxwell: classified alleged items - this has nothing to do with existence!
B. van Fraassen
The Scientific Image Oxford 1980