let arrow = [|
"21 21 4 1";
"       c None";
".      c #FFFFFF";
"+      c #000000";
"@      c #0000FF";
"                     ";
"                     ";
"                     ";
"    .............    ";
"    +@@@@@@@@@@@.    ";
"     +@@@@@@@@@.     ";
"     +@@@@@@@@@.     ";
"      +@@@@@@@.      ";
"      +@@@@@@@.      ";
"       +@@@@@.       ";
"       +@@@@@.       ";
"        +@@@.        ";
"        +@@@.        ";
"         +@.         ";
"         +@.         ";
"          +          ";
"          +          ";
"                     ";
"                     ";
"                     ";
"                     "|]