“Duck or Rabbit” Illusion: Brain Hemisphere Test The classic duck–rabbit illusion (first published in 1892) illustrates how your perception switches between two interpretations — a Gestalt effect often linked to hemispheric tendencies: left for logic, right for creativity. This test is not a diagnosis, but a gentle hint about how your thinking balances itself and how your brain responds to tension. If you saw the duck first Your right hemisphere is more active at the moment. You’re creative, int