The Hoax (Why do they not fly away?) How long does it take you to understand that what you are looking at is not real? This portfolio comes out of the perception of the reality and the illusion it creates. The time we need to figure out what we are looking at shows to what extent we accept the illusion. The docoy crows lapwings and starling standing silent in the snow are misleading signs. They are pleasant illusion for our soul. It take 3-5 minutes for 100 people to understand that birds are not real.