A real-world circle is not a true circle which, as far as Platos concerned, lives in the World of Forms. But isn't a fractal a mathematical form, so that does live in the the World of Forms; and as Mandelbrot pointed out, the coast of England, the shape of a cloud and the shape of a fern are fractals so they too live in the World of Forms?
Going further, isn't the standard model when expressed geometrically a form so that too lives there, and its consequences are too, so the universe itself is in the World of Forms; doesn't this then involve a infinite regress?