Expectations...?

What is the subject,behind the object, or do you see,only what you've trained to see? Do you go to the produce section of a market and taste a grape before you make a purchase? Don't we all test drive a car before we decide to buy? Won't we read a few paragraphs before buying a book, pre-trial music before taking it home... Sometimes,what appears to our eyes, isn't what we expected...but, ....What do you expect?