Considering that the first thing each sub does is copy all the elements of the array, there's not much point in passing a ref and dereferencing it. Just sling the arrays around. 
sub higherLevel
{
  my(@arr) = @_;
  showArray(@arr);
}
sub showArray
{
  my(@arr) = @_;
  foreach my $temp (@arr) { print "$temp\n"; }
}
my(@arr) = ("one","two","three");
higherLevel(@arr);

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Caution: Contents may have been coded under pressure.

In reply to Re^2: a HASH ref while "strict refs" ERROR by Roy Johnson
in thread a HASH ref while "strict refs" ERROR by mosh

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