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By on September 24, 2008, with 35 Comments

Ponzo Illusion CollectionSo, while waiting for someone to help me fix random illusion hack, and for the Yahoo stuff to update the widget, I decided to share an interesting optical illusion collection with all of you. Previously illusions like this were posted in each separate post, but now as we all got used to them, probably better solution is to group them like this. I got this idea when I visited Dark Roasted Blend.

All of these are variations of the original Ponzo illusion. Previously I thought it’s the same phenomena as Ebinghaus illusion, but there is a slight difference. The Ponzo illusion is an optical illusion that was first demonstrated by the Italian psychologist Mario Ponzo in 1913. He then suggested that the human mind judges an object’s size based on its background. He originally showed this by drawing two identical lines across a pair of converging lines, similar to railway tracks. The upper line looked longer because we interpret the converging sides according to linear perspective as parallel lines receding into the distance – a farther object would have to be longer than a nearer one for both to produce retinal images of the same size. If this collection still wasn’t enough for you, be sure to check Ponzo variation of: soldiers, terrain vehicles, nuns, monoliths, pigglets, spheres, monsters and others .

Ponzo Illusion Collection
Ponzo Illusion Collection
Ponzo Illusion Collection
Ponzo Illusion Collection
Ponzo Illusion Collection


35 Responses
  1. Anonymous says:

    good Illusion!!
    wheres your surprise? :D

  2. Anonymous says:

    The surprise is that there’s no surprise… how surprising is that?!

  3. Anonymous says:

    last 2 were the best

  4. Felix says:

    I’d call it lame. Just foreshortening.

  5. Anonymous says:

    cool illusions!!!

  6. Anonymous says:

    I too agree about the surprise!

  7. Anonymous says:

    Look no hands!!

  8. Anonymous says:

    nice. i like the last one

  9. bobo says:

    i love this kind of illusion. it messes with your mind.

  10. Joanna says:

    I agree – fun illusions but what’s your news?

  11. Anonymous says:

    like thoose :)
    very good :)
    ty a lot :)

  12. Anonymous says:

    The last one’s cool.

  13. jinky 1967 says:

    i like these.. now these are optical illusions, tricking the eye and brain.. good stuff

  14. yellowmangroup says:

    it bored me i need something rlly cool

  15. Chris says:

    Sweet stuff,
    and yeah where is that surprise

  16. Tin Soldier says:

    Seems the mac widget is taking me to google reader to add the comments feed to my reader. It used to bring me right to the page for that days illusion.

  17. Anonymous says:

    Is the suprise the “feeling lucky?” bar that’s on the left upper hand corner? By the way, nice illusions.

  18. Anonymous says:

    Huh? Now the “feeling lucky?” bar’s gone.

  19. Anonymous says:

    i don’t see any suprise!
    where is it? =s

  20. Anonymous says:

    Felix – you clearly have no idea what foreshortening means

  21. lolz says:

    no i don’t see it in any pic besides the last two

  22. Anonymous says:

    i dont see it…..???

  23. Samantha Hermundson says:

    the last one is just the same person but its smaller and reversed!!

  24. Samantha Hermundson says:

    and all the other ones the things in the picture are all the same size

  25. olivia says:

    ilove the little short guys! they’re so short! lol!

  26. Me says:

    Milner and Goodale in 1985 suggested that there is action and perception visual systems. The perception is responsible for what. It is known as the Ventral visual stream using a occipital – temporal pathway. Anyway long story short the ventral system is responsible for object size constancy. So the same sized object perceived in further away seems bigger because we try to maintain an object size constancy notion that would be informative of its dimensions based on size/distance interaction. So the illusion is also in the question. Which object is bigger answer correctly the one further away on realistic terms. Which figure is drawn bigger outside a space continuous doesn’t.

  27. Kelly says:

    This reminds me of the mistaken belief that the sun has different optical sizes as it rises and sets throughout the day. People I explain this to do not believe that the image of the sun is the same exact size at sunset (when it appears large) as it is at its peak midday (appearing smaller). This is because we are interpreting the sun’s size in refrence to earthbound objects (buildings, trees, etc.) at sunset/rise, but do not have such apparent contrasting objects when the sun is at its peak. THE TEST: hold you hand at arms length (extended) and cover the sun’s image at its peak. Not which of you finger just barely covers it. Then, at sunset, when the sun is “big”, do the same. The same finger will cover the sun!

  28. mittens says:

    very cool

  29. Brenda Nyawara says:

    it’s all about perspective and they’ve got it all wrong. but still, very funny HAHAHAH!

  30. HippoFest - Download Free Software says:

    That Illusion Below Up Your Mind :P

  31. Health says:

    nice illusion, from big to small

  32. sarcasm says:

    i agree with yellowmangroup. also they are all the same size it is just perspective

  33. Really spooky…. could not beleive it at first…

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