recursive shader generates a recursively rasterized copy of the image in the top left corner. You can paste your own images from the clipboard.
With Type you can choose, if the area is divided into rectangles or triangles.
By clicking the Color-Icons you can switch between the black-and-white and the color mode.
Darkness determines how dark an examined area has to be, to force futher subdivisions. The process of rendering will take longer, the higher this number is.