The relative configurational entropy per cell as a function of length scale
is a sensitive detector of spatial self-similarity. For Sierpinski carpets the
equally separated peaks of the above function appear at the length scales that
depend on the kind of the carpet. These peaks point to the presence of
self-similarity even for randomly perturbed initial fractal sets. This is also
demonstrated for the model population of particles diffusing over the surface
considered by Van Siclen, Phys. Rev. E 56 (1997) 5211. These results allow the
subtle self-similarity traces to be explored.Comment: 9 pages, 4 figures, presented at ECOSS18 (Vienna) Sept. 199