Ex-JPL conceptual artist Kurt Wenner created this anamorphic drawing in 2010 for Greenpeace, to commemorate a million-signature petition opposing genetically modified crops in Europe.
Seen from this angle the illusion is so compelling that it’s hard to tell what’s what. Within the circle Wenner (addressing reporters) is real, as are the five people behind him bearing signs, and the bales immediately surrounding them. But I believe everything else within the ring is drawn. For comparison here’s an image by Pyramid Visuals, which produced the substrate on which the image was printed.
At 22 meters square, the image set a world record at the time as the largest of its kind drawn by a single person.