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