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