Because it is, in fact, a drawing the size of the world.
“With the help of a GPS device and DHL, I have drawn a self portrait on our planet,” writes Swedish artist Erik Nordenankar on his website for the project, appropriately named http://biggestdrawingintheworld.com. “My pen was a briefcase containing the GPS device, being sent around the world. The paths the briefcase took around the globe became the strokes of the drawing.” The resulting drawing’s dimensions are 40,076,592 by 40,009,153 meters – which are about the dimensions of the Earth’s surface, if it could be rolled out as a canvas.
Cool.
UPDATE: Uncool. As Les notes in the comments, it’s a fake.
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Alas, the whole thing turns out to be completely fake. The artist has even admitted it.