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Optical Illusion. Can You Find All The Y's in the picture?

I found this cool Optical Illusion at Brainden.com You can visit them for much more Optical Illusions and Brain Teasers. S...

Thursday, April 6, 2017

The Frankfurter Illusion


A more Detailed Explanation on This Opticall Illusion on 

Optical Illusions & Visual Phenomena

131 of them – by Michael Bach 


in the meantime:


The Frankfurter Illusion



What to do & see
If you have two roughly equiv­a­lent eyes you will see a ‘sausage’ float­ing in front of you in mid air, by fol­low­ing these steps:
  1. Hold your hands in front of you, at 20–30 cm dis­tance from you, at eye level.
  2. Point your index fin­gers against each other, leav­ing about 2 cm dis­tance be­tween them.
  3. Now look “through” your fin­gers, into the dis­tance be­hind them.
  4. The sausage should ap­pear now, and you can change its length by vary­ing the dis­tance be­tween the fin­ger tips.
  5. For most ob­servers, the sausage will look blurred, at least ini­tially.
  6. If you try to look at the sausage, it will dis­ap­pear, it is only pre­sent if you look at some­thing more dis­tant than your fin­gers.
  7. It helps if the back­ground is rather ho­moge­nous and has a color very dif­fer­ent from your fin­gers.

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