From the docs:<p>&quot;It&#x27;s important to note that When rendering with these infinitely-tiled images, the mapping that is rendered is actually the inverse of the function given. This is because it is prohibitively expensive to compute images of the function itself. (In fact, we are rendering a kind of &quot;pull-back&quot;.) Specifically, when rendering a pixel in the image, the location of that pixel in the complex plane is passed to your function, which produces a complex value. That transformed value specifies a location in the original image. This procedure is fast, but plots the inverse of the function given. So, if you want to plot e.g. log(z), then you should instead put in e^z.&quot;