Earth Hour 2009 has come and gone, but the internet is only beginning to fill with incredible photos, art projects and stories of how people celebrated their hour of darkness.
The Earth Hour 2009 light graffiti photos featured in this gallery come to us from an official WWF Flickr pool. They include light writing and Earth Hour themed images created using a slow camera shutter speed and illuminated 'drawing' tools.
Take a look at some more innovative light graffiti below.
Eco-Stunt Photo Tricks
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