.~-*^¤¤###                                          ###¤¤^*-~.
.~-*^¤¤###                                          ###¤¤^*-~.
.~-*^¤¤¤¤#                                          #¤¤¤¤^*-~.
.~-*^¤¤###                                          ###¤¤^*-~.
....-^^¤¤#                                          #¤¤^^-....
.~-*^¤¤###                                     .    ###¤¤^*-~.
.~-*^¤¤###                                        . ###¤¤^*-~.
.~-*^¤####                                    . ~.  ####¤^*-~.
.~-*¤¤#### 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.)                 #¤¤¤^-....
......~*¤#                                          #¤*~......
.....-*^¤¤                                          ¤¤^*-.....
.....-**¤#                                          #¤**-.....
......-^^¤                                          ¤^^-......
.~-*^¤¤###                                          ###¤¤^*-~.