They do this instead:
$hash{red}{green}{brown} = { }
True, that's what comes out of the for loop. Then the next instruction in my sample turns it into the requested result.. Is the following more to your liking?
my $ptr = \%hash;
$ptr = $ptr->{$_} = {} for @array[0..$#array-1]; # fixed; s/shift @arr
+ay/$_/
$ptr->{$array[-1]} = 1;
or maybe
my $ptr = \%hash;
$ptr = $ptr->{shift @array} = {} while @array > 1;
$ptr->{$array[0]} = 1;
Update: forgot to remove the shift when I initially copypasted. See comment.
Makeshifts last the longest.
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