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