.###......                                          ##.###.###
#..#......                                          .##..##..#
#.##......                                          #.#.#.#.#.
##.#......                                          ##########
.###.....#                                          ..........
#..#....#.                                     .    ..........
#.##...###                                        . .........#
##.#..#...                                    . :.  ........#.
.###.##..# 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.)                 ..#.#..###
##..###.##                                          .####.#...
.#.#..##.#                                          #...###..#
####.#.##.                                          #..#..#.##
...####.#.                                          #.##.###..
..#...####                                          ##.##..#..