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bollards have dreadful eyesight which makes playing hide and seek quite tricky.
http://www.funkypancake.com/blog/stuff3/2005/12/DSC07537-thumb.jpg

they have evolved naturally to be bright in colour to overcome their sight problems. a feature we humans exploit by putting them in locations where they can be seen. they are usually so frightened they can't (and don't) move.
http://www.funkypancake.com/blog/stuff3/2005/12/DSC07541-thumb.jpg

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