.,-*%*@¶@#                                          #@¶@*%*-,.
...-**%**@                                          @**%**-...
.,,,,-%@@@                                          @@@%-,,,,.
....,,*%@@                                          @@%*,,....
.....--*%@                                          @%*--.....
..,-*%%*@¶                                     .    ¶@*%%*-,..
.,-*%*@¶@#                                        . #@¶@*%*-,.
.,-*%*@¶##                                    . ,.  ##¶@*%*-,.
.,-*%*¶@## 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.)                 @@¶@*%*-,.
.,-*%*@¶##                                          ##¶@*%*-,.
....,,*%*@                                          @*%*,,....
.,-*%*@¶@#                                          #@¶@*%*-,.
.,-*%*@¶@#                                          #@¶@*%*-,.
......,*%@                                          @%*,......