..##.##..#                                          .#...#..#.
..##.###..                                          ..#...#..#
#.##.#.##.                                          #..#...#..
..##...###                                          .#..#...#.
..###..#.#                                          ..#..#...#
#.#.##...#                                     .    ...#..#...
....###..#                                        . #...#..#..
....#.##..                                    . ..  .#...#..#.
......###. 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.)                 #..#......
......#...                                          ##..#.....
.......#..                                          .##..#....
........#.                                          .###..#...
.........#                                          .#.##..#..
..........                                          ...###..#.