Spoiler!

Download the code or set code wrapping to larger value than default if you want to read this.

Here's the cleaned up code with some explanations.

The code has run-lenght encoded images of the digits.

use warnings;

$INITTERM= "\n"; # originally "\ec"
$r= ' _/\|';
# The format of the rle data in @m is like this:
# One digit for count, one digit for the character: 1=space 2=_ 3=/ 4=
+\ 5=|
# I've inserted spaces for clarity.
$m[0]= '52    112221 113211 113211 51     1142    1142   52     113211
+  1142';
#       _____   __     ___    ___           ____   ____  _____   ___  
+  ____
$m[1]= '153115 211521 133114 133114 153115 1341   1341    4113  153115
+ 133115';
#       |   |    |    /   \  /   \  |   |  /      /          /  |   | 
+ /   |
$m[2]= '153115 211521 311311 311213 153215 1542   1542   311311 153215
+ 143215';
#       |   |    |       /      _/  |___|  |____  |____     /   |___| 
+ \___|
$m[3]= '153115 211521 211321  4114   4115   4115  153115 211321 153115
+  4115';
#       |   |    |      /        \      |      |  |   |    /    |   | 
+     |
$m[4]= '153215 221522 111332 143213  4115   4213  143213 111331 153215
+  4115';
#       |___|  __|__   /___  \___/      |  ____/  \___/   /     |___| 
+     |
$s= 5;
for $k (0..$s-1) { # decode the rle data to plain strings
        while ($m[$k]=~ /(\S)(\S)/g) {
                $t[$k].= substr($r, $2-1, 1) x $1;
        }
}
# @t (orig. @~) now contains the decoded characters, each element is o
+ne line:
# _____ __   ___  ___       ____ _________ ___  ____
# |   |  |  /   \/   \|   |/    /        /|   |/   |
# |   |  |     /    _/|___||____|____   / |___|\___|
# |   |  |    /      \    |    ||   |  /  |   |    |
# |___|__|__ /___\___/    |____/\___/ /   |___|    |
do {
localtime=~ /.*(\d)(\d):(\d)(\d):(\d)(\d).*/;
for $i (0..4) { # for each line
                if ($i==0) # before 1st line, print top of frame
                        { print $INITTERM, "=" x 45, "\n" }
                print "| ";
                # print the first digit
                print substr ($t[$i], $1*5, 5), " ", substr ($t[$i], $
+2*5, 5);
                # the first colon
                print+(($i==2) ? "o " : "  "), (($i==3) ? "o " : "  ")
+;
                # the second digit
                print substr ($t[$i], $3*5, 5), " ", substr ($t[$i], $
+4*5, 5);
                # the second colon
                print+(($i==2) ? "o " : "  "), (($i==3) ? "o " : "  ")
+;
                # the third digit
                print substr ($t[$i], $5*5, 5), " ", substr ($t[$i], $
+6*5, 5);
                print " |\n";
                if ($i==4) # and the bottom frame after the 5th line
                        { print "| ", " " x 41, " |\n", "=" x 45, "\n"
+; }
}
} while(sleep(1.5));

__END__
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