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diff --git a/src/perl/block-graphics-to-ascii b/src/perl/block-graphics-to-ascii
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+++ b/src/perl/block-graphics-to-ascii
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+#! perl
+
+=head1 NAME
+
+block-graphics-to-ascii - map block graphics to ascii characters
+
+=head1 DESCRIPTION
+
+A not very useful example of filtering all text output to the terminal
+by replacing all line-drawing characters (U+2500 .. U+259F) by a
+similar-looking ascii character.
+
+=cut
+
+# simple example that uses the add_lines hook to filter unicode and vt100 line/box graphics
+
+#                  ─━│┃┄┅┆┇┈┉┊┋┌┍┎┏┐┑┒┓└┕┖┗┘┙┚┛├┝┞┟┠┡┢┣┤┥┦┧┨┩┪┫┬┭┮┯┰┱┲┳┴┵┶┷┸┹┺┻┼┽┾┿╀╁╂╃╄╅╆╇╈╉╊╋╌╍╎╏
+my $rep_unicode = "--||--||--||++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++--||"
+#                  ═║╒╓╔╕╖╗╘╙╚╛╜╝╞╟╠╡╢╣╤╥╦╧╨╩╪╫╬╭╮╯╰╱╲ ╳╴╵╶╷╸╹╺╻╼╽╾╿▀▁▂▃▄▅▆▇█▉▊▋▌▍▎▏▐░▒▓▔▕▖▗▘▙▚▛▜▝▞▟
+                . "=|+++++++++++++++++++++++++++++++/\\X-|-|-|-|-|-|#____#######|||||###~###########";
+
+#              ↑↓→←█▚ ☃HIJKLMNOPQRSTUVWXYZ[\ ]^ ◆▒␉␌␍␊°±␤␋┘┐┌└┼⎺⎻─⎼⎽├┤┴┬│≤≥π≠£·
+my $rep_acs = "↑↓<>#\\☃HIJKLMNOPQRSTUVWXYZ[\\]^ ◆#␉␌␍␊°±␤␋+++++⎺⎻-⎼⎽++++!<>π≠£·";
+
+sub on_add_lines {
+   my ($self, $str) = @_;
+
+   $str =~ s/([\x{2500}-\x{259f}])/substr $rep_unicode, (ord $1) - 0x2500, 1/ge;
+
+   $str =~ s/([\x41-\x7e])/substr $rep_acs, (ord $1) - 0x41, 1/ge
+      if $self->cur_charset eq "0";
+
+   $self->scr_add_lines ($str);
+
+   1
+}
+