The book was written in the eighties of the last century. Being encouraged by the editorial board of monthly Delta in the person of Professor Marek Kordos, the author’s first aim was a collection of essays about Peano maps, lakes of Wada, and several singularities of real functions. But it was the time when university duties stopped and the author could freely meditate whether this curious mathematics had its roots in the forgotten past. He remembered old authors who began their books with the words “already the ancient Greeks… .”