the public of something is the same for the nothing of same mean
no_thing is nothing_yet_no_one_knows. public_high_school is tangible_thing. information_office is not tangible_thing. public_square is not tangible_thing. public_fact is not one_everyone_knows. public_fact is one_everyone_knows. namely is that_is_to_say. public_square is tangible_thing. no_thing is not nothing_yet_no_one_knows. common_room is not tangible_thing.