On the Existence of a Self-Similar Coarse Graining of a Self-Similar   Space
  A topological space homeomorphic to a self-similar space is demonstrated to be self-similar. There exists a self-similar space $S$ whose coarse graining is homeomorphic to $S$. The coarse graining of $S$ is, therefore, self-similar again. In the same way, the coarse graining of the self-similar coarse graining of $S$ is, furthermore, self-similar. These situations succeed endlessly. Such a self-similar $S$ is generated actually from an intense quadratic dynamics. 
Akihiko Kitada, Tomoyuki Yamamoto, Tsuyoshi Yoshioka and Shousuke   Ohmori
math-ph math.MP