Just for the fun of it...

package base1arrays;

use strict;
use warnings;

sub TIEARRAY {
  my ($pack,$arr) = @_;
  bless $arr, $pack;
}

sub FETCH {
  my ($arr,$i) = @_;
  return $arr->[$i-1];
}

sub FETCHSIZE {
  @{$_[0]};
}

sub STORE {
  my ($arr,$i,$v) = @_;
  $arr->[$i-1] = $v;
  return;
}

1;
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Test:

use strict;
use warnings;
use feature qw/ :5.10 /;

use base1arrays;

my @orig = qw/1 2 3 4 5/;
tie my @arr, 'base1arrays',\@orig or die $!;

say for (1..@arr);

# "negative" (< 1) index also works
say $arr[0];  # Prints 5
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