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