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Hom.Od.23.181-189

So everyone loves the moment of recognition between Penelope and Odysseus and how Penelope basically "forces the true Odysseus" come out with her own trick. Many believe that the recognition happens because of the detailed account of how he made the bed and how it was the secret only a few knew but in my opinion this is not 100% true.

Penelope did not recognize her husband because he analyzed their secret; she recognized him because of his reaction.

Odysseus replied "in a burst of anger". He is exaspirated, afraid, worried and surprised. That is the husband she wants to see; the husband who wants nothing else but his home, his roots and his wife. Anyone could reveal to any mortal the secret of her bed; from one of the servants till one of the gods but there is one thing no one can fake;

The GENUINE emotion. Odysseus replied so immediately and so abruptly in such a genuine emotion that left Penelope no doubt yet that this was her husband. Odysseus didn't just ask her how it is possible to move the bed; he asked her in ANGER a genuine exaspiration and disbelief. No actor or god could mimic that genuine emotion. Odysseus spent about half his time in Ithaca hiding his emotions so he would survive. At that moment of the mention of moving the imovable bed his emotions just showed.

i am not being metaphorical, i work in a garden center, stop buying plants 'to bring in the bees and butterflies' and then immediately poisoning every caterpillar that dares to consume a single leaf

Understanding. In those eyes I saw pain, and what is pain if not evidence of intelligence?