Parallel, Independently Published Parallel, Perpendicular & everything in between

A first true book about lines - not lines to memorize, but lines to see. A child meets the point, the line, and the segment; then parallel and perpendicular, the two ways lines can agree and disagree; then the whole leaning world of angles in
between, named and felt in the child's own arms and body. Built to be true all the way down, with nothing a child must later unlearn, and ending exactly where the next book begins: ready to measure.