不知行上還是行落的《Ascending and Descending》 http://66.70.254.100/art/Hash/Escher/EscherSecrets.html中也有這圖形的動畫http://66.70.254.100/art/Hash/Escher/Escher1.mov This is a clip (Sorenson, 15fps, 1.4Mthat shows a \"monk\'s eye view\" of one loop around the Penrose staircaseincorporated into \"Ascending/Descending\". Here you can see a bit of thesecret behind the illusion: namely, the sharp downhill after the firstturn--a section that in the original image looks like it should begoing uphill.
\"The \'flat shape\' irritates me - I feel as if I were shouting to my figures, \'You are too fictitious for me; you just lie there static and frozen together; do something, come out of there and show me what you are capable of!\' So I make them come out of the plane.\" - M.C. Escher
Fun Fact:
Did you know that, like Michelangelo, Leonardo da Vinci, Dürer and Holbein, M.C. Escher was left-handed?