.#.#....#.                                          ####....#.
####...##.                                          ...#...##.
...#..#.##                                          ..##..#.##
..##.###..                                          .#.#.###.#
.#.##..#.#                                          #####..###
###.#.####                                     .    ....#.#..#
..####...#                                        . ...####.#.
.#...#..##                                    . ,.  ..#...###.
##..##.#.# 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.)                 #####.#.#.
###..#.###                                          ....######
..#.###..#                                          ...#......
.###..#.##                                          ..##......
#..#.###..                                          .#.#......
#.###..#.#                                          ####.....#