@Felix_Krull @judgedread He doesn't actually justify nor explain the change, he makes leaps in logic, backwards extrapolates to fill in queries that no one asked with speculative standards and conditions and hypothetical limits on a process he can't define. And, also suggests logical continuation where no initial logical formation exists as a foundation for it to be laid upon. "A cup naturally follow the light sensitive spot." By, intellectual progression of design, sure... Not by inherited traits/random process. The light sensitive spot developing from nothing is just as strange as any accompanying mechanical aid to it. As it all implies continued development with intent. Where is the intent coming from? Certainly not from the creature as it doesn't even have an intrinsic awareness of how its body functions. Not from "natural selection" either of breeding pairs, because how does a protrusion come about at all? Or, the spot for that matter?