#..#..#...                                          ......##..
.#..#..#..                                          #.....###.
..#..#..#.                                          .#....#.##
#..#..#..#                                          ..#.....##
##..#..#..                                          #..#....#.
###..#..#.                                     .    ##..#.....
#.##..#..#                                        . .##..#....
..###..#..                                    . ^.  .###..#...
..#.##..#. 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.)                 ..#.##..#.
###..#.##.                                          ....###...
#.##...###                                          #...#.##..
..###..#.#                                          ##....###.
..#.##...#                                          .##...#.##
#...###..#                                          .###....##