Joseph Herlant
version 1.0.0, 2013-10-25 : Initial version

This one prints out a Mandelbrot set in ascii art. For more informations about Mandelbrot set which is a matematical set whose boundary is a recognizable two-dimensional fractral shape, check the dedicated wikipedia page!

perl -e 'local $\="\n";$y=$_/13-1.5,print map{$a=$b=0;$c=64;$b=2*$a*$b+$y,$a=$p-$q+$_/33-1.5 while--$c&&($p=$a*$a)+($q=$b*$b)<2;$c?substr("!torblednaM",$c%11,1):" "}(0..78)for(0..38)'

Output:

ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd
ddddddddddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeddddddddddddddd
dddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeedddddddd
dddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeedddd
dddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
ddddddddddddddddddeeeellllllllllllllbbbbrroodeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
ddddddddddddddddllllllllllllllllbbbbbbbrrrrt!ndlMtobbeeeeeeeeeeeeeeeeeeeeeeeeee
ddddddddddddddlllllllllllllllbbbbbbbbbrrrrMald e!!trrbbbbbeeeeeeeeeeeeeeeeeeeee
ddddddddddddllllllllllllllbbbbbbbbbbrrot!n      Mletrrrrbbbbbleeeeeeeeeeeeeeeee
ddddddddddllllllllllllllbbbbbbbbboooott!Mnt      na!ttorrrrrrbllleeeeeeeeeeeeee
dddddddddlllllllllllllbbbbbbbMtlrnMMa !r  rtM  e    oebn!oottdMolllleeeeeeeeeee
dddddddllllllllllllbbbbrrroot!na   r                    rla  Md!rllllleeeeeeeee
ddddddlllllllllllrrrrrrrooooeano                            rltorrllllleeeeeeee
dddddlllllllllrrrrrrrrooo!Mla                               M !ttrblllllleeeeee
dddddllllllttt!rnMtttttt!!                                      enbllllllleeeee
ddddrrot!MebtaMo  !leMMMad                                     M!obbllllllleeee
ddddrrtttnr           arbt                                     dtrbbblllllleeee
dddrrrMn!               o                                     etrrbbbllllllleee
dddMe   b                                                    !torrbbbllllllleee
dddMe   b                                                    !torrbbbllllllleee
dddrrrMn!               o                                     etrrbbbllllllleee
ddddrrtttnr           arbt                                     dtrbbblllllleeee
ddddrrot!MebtaMo  !leMMMad                                     M!obbllllllleeee
dddddllllllttt!rnMtttttt!!                                      enbllllllleeeee
dddddlllllllllrrrrrrrrooo!Mla                               M !ttrblllllleeeeee
ddddddlllllllllllrrrrrrrooooeano                            rltorrllllleeeeeeee
dddddddllllllllllllbbbbrrroot!na   r                    rla  Md!rllllleeeeeeeee
dddddddddlllllllllllllbbbbbbbMtlrnMMa !r  rtM  e    oebn!oottdMolllleeeeeeeeeee
ddddddddddllllllllllllllbbbbbbbbboooott!Mnt      na!ttorrrrrrbllleeeeeeeeeeeeee
ddddddddddddllllllllllllllbbbbbbbbbbrrot!n      Mletrrrrbbbbbleeeeeeeeeeeeeeeee
ddddddddddddddlllllllllllllllbbbbbbbbbrrrrMald e!!trrbbbbbeeeeeeeeeeeeeeeeeeeee
ddddddddddddddddllllllllllllllllbbbbbbbrrrrt!ndlMtobbeeeeeeeeeeeeeeeeeeeeeeeeee
ddddddddddddddddddeeeellllllllllllllbbbbrroodeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
dddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeee
dddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeedddd
dddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeeedddddddd
ddddddddddddddddddddddddddddddddddddeeeeeeeeeeeeeeeeeeeeeeeeeeeeddddddddddddddd
ddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddddd