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§%%%%%†«:. gull call.                    .      . : .:«†%%%%%§
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@**†:.....                                          .....:†**@
#@@§*%†«:. 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.)                 .:«†%*§@@#
@§%««:::..                                          ..:::««%§@
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§§*†«.....                                          .....«†*§§