Crooked logs make straight fires.

A log does not have to be straight to make a good fire. An irregular shape need not prevent something from serving its purpose.

The proverb challenges the habit of judging worth by outward form. Something that looks imperfect can still produce a valuable result.

Use it when someone dismisses a person, material, or approach because it looks unconventional, even though it may work well. The emphasis is on practical value rather than appearance.