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I don't know why, but I found the old one - colourful as it was - a bit oppressive.
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Apparently humans respond well to visible space and foliage. The real thing is best, but even pictures can help you focus. It's one of those caveman survival-psychology things. If you have lush vegetation and a good view of the surrounding area, your brain goes "Woah, I could live safely here for a long time", and makes you feel happy. Or something like that, but with more sex.
And that's why people have pot plants in offices.