Try playing with that for 1 .. 4 loop. I really don't know fractals so to my uneducated eye it looks like more detail after more iterations. I pushed it up to 5 but it didn't fit ony my screen anymore.

__SIG__
printf "You are here %08x\n", unpack "L!", unpack "P4", pack
  "L!", B::svref_2object(sub{})->OUTSIDE;
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