I am sorry to disappoint you, arhuman, but the following is not shorter (94 bytes, darn scalar)... But well, it's recursive... and just another way to do it.
<code>
sub _{($x,$_)=@_;s/(.*)\n/\n $1@/g;$x>40?x:_($x+2,scalar reverse'@'x$x."\n$_\n".$"x$x)}_;print
<code>
Change the 40 for smaller or bigger spirals...
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