Is it a bird? Is it a plane?
No, it's trompe l'oeil and it's at that oddly fascinating site Mighty Optical Illusions which brought you 3D sidewalk art and Cardiff Bay Baragge Illusion by Felice Verini (yup that's a double g, though not, of course the official spelling) . But I think the most impressive trompe l'oeil on the site so ...
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