Visitor with user name giaN ewan mailed me bunch of illusions, where most of them already appeared on the site. However, this little picture triggered my curiosity. At first I didn’t quite get it, but after some research I found the explanation. Boy was I surprised! Actually the initials you see at the back and beneath, are shadows of the object in the middle. Casting light from three different angles, exposes shadowy initials of Gödel, Escher and Bach! These are called “Ambiguous Objects”, and appeared on the cover page of Douglas Hofstadter’s bestseller.
