#!/usr/bin/perl

use strict;
use warnings;
use Data::Dumper;

my ( @open, @closed );

my $open = 1;
push @{ $open ? @open  : @closed }  => 'boo!';
push @{ $open ? \@open : \@closed } => 'boo!';
print Dumper( \@open );

push @{ @{ @{ @{ @{@open} } } } } => ['bar'];
print Dumper(\@open);