a good example would be fable 2 vs fallout 3
fable is a colourful fantasy world, where as fallout is a nuked out wasteland, if you were to swap the colours, each game would look odd to say the least.
...not much time to post anymore, used to be awesome on here really good fond memories from VGchartz...
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really miss the VGCHARTZ of 2008 - 2013...