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