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Outlining
and giving your buildings and objects highlights makes them stand
out more, and gives them a polished look. Black outlines help
people to distinguish objects from the background and tend to
make the object look more cartoonish than say if the outlines
were simply darker versions of the objects color. Highlights on
the other hand, round off the corners of sharp objects and help
the pseudo 3D appearance. If you shine a light onto a square object
you can sometimes notice that the very edges shine in the light
and appear brighter than the side which has the most light shining
on it.
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