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