Thursday, April 30, 2015

Z is for . . .

The final Mad-Cool-Math Nugget is . . . the Zollner illusion.











Image courtesy: Wikipedia

Besides making you go cross-eyed, the purpose of this optical illusion is to make your brain doubt that the diagonal lines in this image are parallel. The shorter lines set on angles mess with your perception. This illusion is named for the person who designed it: German astrophysicist Johann Karl Friedrich Zöllner. (Wikipedia)

Want to see more? Go to this Wikipedia page. I grabbed a few of my favorites to share here.

In this Simultaneous Contrast illusion, the background changes from dark grey on the left to a lighter grey on the right. Believe it or not, the bar in the middle is one shade of grey. Yes, really.












Image courtesy: Wikipedia

In this next one, focus on the black dot while you move your face closer to and then away from the screen. Don't go too fast. We don't want any broken noses. The outer rings should appear to rotate. Trippy.















Image courtesy: Wikipedia

And finally, the dancer. Is she moving clockwise or counterclockwise? The first time I saw this she seemed to switch direction after a second and danced clockwise from then on. I keep trying to see her dance counterclockwise, but my mind isn't cooperating. Typical. (I was also one of those people who saw "The Dress" as cream and gold.)


Spinning Dancer


By Nobuyuki Kayahara (Procreo Flash Design Laboratory) [CC BY-SA 3.0], via Wikimedia Commons

And that's all folks! Sing it with me: Now I've blogged my ABCs, next time won't you blog with me!

 It's been a blast. Thank you to all who've stopped by, commented, followed, and maybe even made off with a free download of one of my stories. Special thanks to those bloggers who kept coming back for more despite the math theme, including

Chrys Fey at Write With Fey

Nick Wilford at Scattergun Scribblings

Cold As Heaven

Rena Rocford at Doctor Faerie Godmother

Lynda Grace An Hour Away

Sarah Foster at The Faux Fountain Pen

Keith's Ramblings

Mark Coopman at Viginette's from VA (and D.C. too!)

Alex J. Cavanaugh

If I forgot anyone, my sincere apologies. See Read you next week at the IWSG!

_______________

Finally, if you missed any of the free downloads from my new collection Ursa Major And Other Stories, the price is reduced today through the month of May.



81 comments:

  1. Kept coming back because it was fascinating!
    The dancer did seem to change direction.
    And by blocking out the background grey, you can see that the bar is only one shade. Really wild.

    ReplyDelete
  2. Hey, I could use some more math in my life!!
    I'm only seeing clockwise...hmm. I tried squinting at the first one and then I could tell the lines were parallel.

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  3. I love illusions! I think the dancer is moving clockwise. I think the trick is to only look at her extended leg.

    I had fun visiting your blog and checking out your posts for the day. It was interesting and I learned a lot. :)

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  4. These optical illusions are cool.

    And thanks for sharing all the math stuff. I always appreciate those who show and promote the fun in math >:)

    Cold As Heaven

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  5. Wearing tri-makes me automatically look away with spinning things, and those illustrations people often post. The blending of the lenses somehow makes me nauseated with things like that, so I've learned to quickly look away. But, I do wonder...what is the point in having something that is straight not appear straight?

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    Replies
    1. Good question! There are so many different types of illusions I wonder if people design them just because they find it interesting or if there are applications such as correcting different problems with vision? Worth looking into.

      Delete
  6. ... and as usual, I find the most fascinating blogs right at the end of April. Never mind, I'll be back to go through and enjoy your earlier posts at my leisure (if I have any!)
    Congrats on doing your alphabet as well as your sums this month!

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  7. I think this is the post I like the best! Wow, too cool! I saw the dress as gold and white also. I thought the original was? She looks like she's going clockwise to me. Is she supposed to be going counter? I have one of your stories, and now that the A to Z is over, I might actually have time to read it! Glad you made it through the A to Z! I've enjoyed your blog and the theme. See you during reflections...? And I'll be co-hosting IWSG! Lisa, co-host AtoZ 2015, @ http://www.lisabuiecollard.com

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  8. I enjoyed your a-z theme and even learned a little something along the way.
    The dancer is going clockwise, isn’t she?

    ReplyDelete
  9. Thanks so much for your fascinating and informative posts even if they did sometimes go over my head! As for today's,I made the mistake of looking at it after a few drinks too many and the first image in particular did something very strange to tonight's head! Seriously though, I can't thank you enough for your loyal support throughout the challenge and I'll be back to check you out when I get back from my holiday.
    Keith's Ramblings

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  10. Usually, when I'm not tired, I can make the girl turn both ways. If I am tired, the direction she spins depends on whether I was creative or logical for most of my day.

    Congrats on beating the challenge!

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  11. I love illusions like this! I can only wonder at how you go about creating them, guess that's why I'm not a maths person, but nevertheless I did my best at following along with your posts. They were pretty neat. Congrats on an excellent Challenge!

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  12. The dancer goes either way for me, depending on when I'm looking. Or which I'm looking for.

    I thought the math theme was cool. But I guess I'm weird.

    ReplyDelete
  13. I laughed when the circles began to move (you know I'm showing this one to the three boys!!) and the dancer changed directions on me, too (which is NOT the first time *that's* happened :)

    Thanks for the shout out and THANK you for stopping by so often, too :)

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  14. I love those optical illusions. The dancer has gone both ways for me. Congrats on finishing the challenge.

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  15. ooh! Love these! Even with my slight headache... I've really enjoyed your posts my dear! Look forward to getting to know you in the so-called normal world!

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  16. ooh! Love these! Even with my slight headache... I've really enjoyed your posts my dear! Look forward to getting to know you in the so-called normal world!

    ReplyDelete
  17. Those are very cool optical illusions! The dancer remained going clockwise for me. But I thought the gray bar was very interesting. Congratulations on completing the challenge!

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  18. I remember those pics you would stare at and an image like a pirate ship or an airplane would appear in the center.

    Greta great great posts and I'll mention you in my Reflections Post.

    ReplyDelete
  19. Note to self: Don't drink St Germain and then look at optical illusions. Note to Tamara - great work on this blog, I have enjoyed every visit! -- Jeri from storytellingmatters.wordpress.com

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  20. Love the optical illusions! The earlier commenter is right--if you squint at those lines until the little lines are blurry, you see the lines as parallel.

    But I can't make the dancer turn counter-clockwise.

    ReplyDelete
  21. J here, stopping by from the #atozchallenge. Thank you for visiting by my blog recently.
    I love optical illusions.
    The dancer is only going clockwise for me. Odd.
    -J @JLenniDorner

    ReplyDelete
  22. Wow. The dancer was making me dizzy. Not sure if she changed direction or what direction she was going.

    ReplyDelete
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I will do everything in my power to visit commenter's blogs unless I've been abducted by aliens or my children get sick. (If my children get abducted by aliens, I will be very busy, of course, catching up on my sleep.)