#...#.##.#                                          ..#..#...#
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##.##.#...                                     .    #...##.#..
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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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##....##..                                          #.#.#####.
#.#...#.#.                                          #####....#
.###..####                                          .....#...#
##..#.#...                                          #....##..#