Who has the right perspective not to be fooled? Definition of illusion which will trick your confidence in senses, but amaze you by doing it; the world that will confuse you. Visit our web site for more informations : www.illusion-group.it. The Illusions Index is a fully searchable curated collection of optical and sensory illusions on the world-wide web. When was the last time you read a story where the villain was celery?