Magicians and generals have had a long-standing relationship – one that produced very real effects during wartime. Harry Houdini snooped on the German and the Russian militaries for Scotland Yard. English illusionist Jasper Maskelyne is reported to have created dummy submarines and fake tanks to distract Rommel’s army during World …

Optical illusions (or visual illusions) are tricks that your mind plays on you based on what you think you are seeing. The image that is being visually perceived is deceptive and does not tally with actual reality. So what you are seeing and what comes out after being processed by the …