Well the difference is between not noticing that there are dashes with different length and thinking that the dashes of different length mean the same thing If you showed me a picture of a bunch of penguins I might think that theyre all the same kind of penguin and if you told me Some of these are Emperor penguins and some are puffins or whatever Id say Oh I didnt know that I never really would have formed an opinion as to how many kinds of penguin there were in the picture If you asked me I might even get it wrong but Im not actively harboring a misconception because I havent really formed a conception in the first place If instead you told me I could tell a male penguin from a female penguin because all female penguins have green feet Id think I knew how to tell a male from a female but Id be wrong