I don't know how I found "The Dot and The Line," but it was second to none when it came to mathematical stories.  It captured the heart, was fun, and taught many lessons along the way.  I taught mathematics for 32 years; not every child learns math from the book or by pencil and paper I thought it important to use more creative ways to teach the subject.  Every Valentines Day I would read "The Dot and The Line" to my kids; oh, did I mention, I taught 7-12.  The line was in love with the dot but she would have nothing to do with him, he had no shape.  So try as he would he just couldn't bend until one day he makes a triangle!  Then it's on to a rhombus, parallelogram, square, rectangle, ... well, you get the picture.  Depending on the class, 7th or 11th grade math, I had them write a love story that showed their understanding of these picture books and the geometry involved (and properties).  By the time I retired students in my classes would ask if we were going to read "The Dot and The Line," and its cover was falling off.  I still have it and many of their stories; the best find I ever had.