...~~^†$§#                                          #§$†^~~...
..~~^†$§##                                          ##§$†^~~..
.~~^†$§###                                          ###§$†^~~.
..~~^†$§##                                          ##§$†^~~..
...~~^†$§#                                          #§$†^~~...
....~~^†$§                                     .    §$†^~~....
.....~~^†$                                        . $†^~~.....
......~~^†                                    . ~.  †^~~......
.......~~^ gull call.                    .      . ~ ^~~.......
........~~ ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ ~~........
.........~                                          ~.........
.......... the seagull  is  a metaphysics trick;  a ..........
.........~ world-builder's  shortcut,  to define  a ~.........
........~~ section  of  reality and imply its size: ~~........
.......~~^ place  a flock of birds at the edge  and ^~~.......
......~~^† make  their  calls  tesselate  over  the †^~~......
.....~~^†$ entire volume                            $†^~~.....
....~~^†$§                                          §$†^~~....
...~~^†$§# a  seagull can be defined  by as  little #§$†^~~...
..~~^†$§## as  five  vertices;  six  triangles.  (i ##§$†^~~..
.~~^†$§### would recommend  handling  in swarms  of ###§$†^~~.
..~~^†$§## at least a dozen birds.)                 ##§$†^~~..
...~~^†$§#                                          #§$†^~~...
....~~^†$§                                          §$†^~~....
.....~~^†$                                          $†^~~.....
......~~^†                                          †^~~......
.......~~^                                          ^~~.......