It could be said that his explanations of the illusions are wrong: there is a spiral in the final image, it's just masked out by concentric circle outlines. Par

It could be said that his explanations of the illusions are wrong: there is a spiral in the final image, it's just masked out by concentric circle outlines. Particularly toward the center of the image where the resolution is so low that it all blurs together anyway it is hard to argue that is not a genuine (if blurry) spiral.