This Korean saying is essentially the direct opposite of "never judge a book by its cover."

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    If it looks like a duck, swims like a duck, and quacks like a duck, it's probably a duck. – StoneyB on hiatus Dec 23 '15 at 12:29
  • A shorter form is "If it quacks like a duck, it's a duck". – Graffito Dec 23 '15 at 12:43
  • @e86 "If the shoe fits, [you can] wear it" en.m.wiktionary.org/wiki/if_the_shoe_fits#English – Elian Dec 23 '15 at 12:55
  • "Follow your instinct and [always] trust appearances". It's not an idiom, but ... – Graffito Dec 23 '15 at 13:01
  • Are you saying this phrase means "Always judge a book by its cover," usable in both positive and negative situations? And is there a sense of looking good makes something good? – Kimball Dec 23 '15 at 15:16

You can probably consider the following in addition to some wonderful suggestions in comments

What you see is what you get

The product you are looking at is exactly what you get if you buy it


It is a popular phrase in the computer industry. It is abbreviated to WYSIWYG (pronounced as "wiz-ee-wig"). For instance, if you are printing a document, whatever you see on the computer screen will be exactly printed as it is without any changes whatsoever.

For more reading , go here

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Here are a couple expressions that come close:

"If it looks like a duck, swims like a duck, and quacks like a duck, then it probably is a duck."

"Where there's smoke, there's fire."

Actually, there are a number of Google hits for "If it looks good, it tastes good," though that expression isn't familiar to me. Note the similar Japanese proverb, "Food should feast the eyes as well as the stomach."

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  • Based on the OP's description, I don't know that that Japanese proverb is so similar. – Kimball Dec 23 '15 at 15:13

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