.-~/^$#@##                                          ##@#$^/~-.
..-~/^$#@#                                          #@#$^/~-..
...-~/^$#@                                          @#$^/~-...
....-~/^$#                                          #$^/~-....
...-~/^$#@                                          @#$^/~-...
..-~/^$#@#                                     .    #@#$^/~-..
.-~/^$#@##                                        . ##@#$^/~-.
..-~/^$#@#                                    . -.  #@#$^/~-..
...-~/^$#@ gull call.                    .      . - @#$^/~-...
....-~/^$# ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ #$^/~-....
...-~/^$#@                                          @#$^/~-...
..-~/^$#@# the seagull  is  a  metaphysics trick; a #@#$^/~-..
.-~/^$#@## world-builder's  shortcut,  to  define a ##@#$^/~-.
..-~/^$#@# section of reality  and  imply its size: #@#$^/~-..
...-~/^$#@ place a flock  of  birds at the edge and @#$^/~-...
....-~/^$# make  their  calls  tesselate  over  the #$^/~-....
...-~/^$#@ entire volume                            @#$^/~-...
..-~/^$#@#                                          #@#$^/~-..
.-~/^$#@## a seagull can be  defined by  as  little ##@#$^/~-.
..-~/^$#@# as  five  vertices;  six  triangles.  (i #@#$^/~-..
...-~/^$#@ would recommend  handling  in swarms  of @#$^/~-...
....-~/^$# at least a dozen birds.)                 #$^/~-....
...-~/^$#@                                          @#$^/~-...
..-~/^$#@#                                          #@#$^/~-..
.-~/^$#@##                                          ##@#$^/~-.
..-~/^$#@#                                          #@#$^/~-..
...-~/^$#@                                          @#$^/~-...