The "Look" Test

As I study Informal Logic and argumentation, it occurs to me that arguments and persuasion are not necessary when the subject of discussion can be observed or if the discussants can "take a look". However if two discussants observe the same thing and understand it in different ways, then more looking is necessary.  There has to be some set of logical relationships inherent in the subject of a  topic that can be understood equally otherwise the subject of the topic couldn't exist outside of the mind that produced it.

Looking should always carry more force or be more persuasive than any argument.  Artifacts should always be more persuasive than arguments.