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