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