----------------------------------'each nail'------------------------------------------
                 ­                                     e
                          ­             always in the wall
                                                      t
    ­                                                  e
             ­                                         r
                      ­                                s
                               ­                       w
                                        ­               i
                                                       t
                                                       h
                                           ­            t
                                                      h
       ­                                                e
                                                       b
                                                       o
                                                       d
                                                       y