Fascinating optical illusions.

[octave]

I have always found optical illusions fascinating because as well as being mind blowing they also give me an insight into how my brain (my second favorite organ) functions.

 

The Illusion Only Some People Can See

[willedoo]

That was a very good presentation. I tried making one out of cardboard with no success. There might be a bit more to the construction required than my crude effort. It's fascinating stuff; I always liked the drawings of M.C. Escher and then there was that three pronged thing.

[Old Koreelah]

Octave I must admit to not watching that video right thru in one session;
I had to take a couple of breaks to give my brain a chance to catch up.

[octave]

9 minutes ago, Old Koreelah said:

Octave I must admit to not watching that video right thru in one session;
I had to take a couple of breaks to give my brain a chance to catch up.

I know what you mean!

[willedoo]

The author of the video said he also had to get the lighting right to get the effect of the revolving not quite rectangle thing.

[nomadpete]

What one 'sees' is data supplied by erratic scanning of eyeballs, then processed by the brain to arrange a composite image. Unfortunately the brain is sometimes influenced by what one is already thinking about.

[old man emu]

There is an outdoor optical illusion near Bankstown Airport. Use Google maps to find Camofleur Reserve Bankstown and use satellite view to get down onto the road. If you move along the road (by clicking on the arrows in the circles) you will see it change shape. Originally there was a picture of a Spitfire in a hangar. 

[onetrack]

The Penrose Impossible Triangle is a large sculpture mounted in the centre of a roundabout in East Perth. It's 13.5M in length.

 

https://mapio.net/pic/p-17819147/

 

https://upload.wikimedia.org/wikipedia/commons/3/38/Perth_Impossible_Triangle.jpg

 

 

Edited March 22, 2022 by onetrack

[Marty_d]

How many crashes has that caused?

[rgmwa]

26 minutes ago, Marty_d said:

How many crashes has that caused?

I've often driven past it and never realised what it was, although wondered what it was supposed to be. Just looks like a wonky U unless you're at the right spot.

 

[onetrack]

3 hours ago, Marty_d said:

How many crashes has that caused?

No more than the normal number of crashes I'd expect - as the number of road users who even understand the basics of roundabout operation, seems pretty low. It doesn't really grab your attention until you're on foot, and walking around it.

[Bruce Tuncks]

I'm a skeptic. I went to a hypnotism show and didn't believe any of it. I would reckon the illusion would not work in reality but all things are possible on video.

[nomadpete]

Back to topic - images.

 

I need therapy. It took me ten minutes of staring at this picture before i suddenly saw the people. In a Pro Hart way.

 

[Marty_d]

I see people... the lower half of them, anyway!

[Jerry_Atrick]

And of those I see, it makes me very happy

[nomadpete]

Once I managed to see the people, it took me ages to revert to seeing my first impression. But that was worth the effort

[Marty_d]

5 hours ago, nomadpete said:

Once I managed to see the people, it took me ages to revert to seeing my first impression. But that was worth the effort

It's the internet, Peter.  You can see high definition images of those whenever you want.

[willedoo]

It's the right brain/left brain thing. When the alternate views of the image appear, you can almost physically feel the shift in thought to the other hemisphere of the brain. Artists spend more time using the right side of the brain, accountants use the left.

[nomadpete]

1 hour ago, Marty_d said:

It's the internet, Peter.  You can see high definition images of those whenever you want.

It's OK Marty. I am more pleased by memories of real ones that I have had the privilege of viewing 😉

[red750]

As we are discussing artists and left/right brain, check out this guy. Yes it is speeded up, but this is almost beyond belief.

 

 

 

 

[nomadpete]

1 hour ago, willedoo said:

Artists spend more time using the right side of the brain, accountants use the left.

I once had a creative accountant doing my tax returns. He was really GOOD.

 

Are you saying that he was using 100% of his brain? So a 'normal' accountant only uses one hemisphere - and they should halve their hourly charges.

[willedoo]

One excellent book is 'Drawing on The Right Side of The Brain' by Betty Edwards. There are right brain people who have a natural talent for art, and left brain people who are terrible at it. This book benefits both, but is especially good at teaching left brain people to train the right side of the brain to enable them to draw well. In the book, she gives examples of before and after art attempts by students, as well as examples by famous artists. One memorable one is a sketch by Vincent Van Gogh. The 'before' sketch was terrible and it was obvious he had no natural talent, and coudn't draw to save his life (or ear). The next Van Gogh sketch example was dated about 12 months later, and the difference was incredible. It was of the high standard that carried on through his brief but prolific career. The author's point was that anyone can learn to draw if they do it the 'right' way.

[red750]

[onetrack]

Nope, I can only see a set of upside-down stairs, no matter how long I look at the picture.

[facthunter]

Blink and see if it helps. Your brain is very involved in what you "see" and fills in stuff to makes sense of it.  In this case there's two possibilities  of about equal validity.  Nev