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Great Optical Illusions (Was: Why color cannot just be wavelength).
Posted: 17 August 2009 05:44 PM   [ Ignore ]   [ # 31 ]
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Another neat optical illusion—four concentric circles that REALLY don’t look it ...

That’s one of the best I’ve ever seen. Ooooff!

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Row row row your boat gently down the stream.  Merrily Merrily merrily merrily life is but a dream!

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Posted: 17 August 2009 08:42 PM   [ Ignore ]   [ # 32 ]
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Kritikos, I used to do some painting, I learned long ago that there were several ways to get the same shade and hue of a color. You did not have to mix the color exactly the same was to get the same shade the very saturated colors of red, brown and green. I also discovered early on that my color blind dad would see them as completely different colors and could easily tell exactly where the new and old paint colors were.

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Church; where sheep congregate to worship a zombie on a stick that turns into a cracker on Sundays…

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Posted: 20 August 2009 09:03 AM   [ Ignore ]   [ # 33 ]
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This isn’t really an optical illusion but the film uses 35,000 different photos and “It combines an innovative mix of stop motion and live projection mapping techniques.”  I don’t know exactly what that means but things get interesting around 1 minute in:

http://www.vimeo.com/3114617

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Posted: 20 August 2009 09:09 AM   [ Ignore ]   [ # 34 ]
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Cool—thanks. I wonder how they did it, it looks like a video taken of sophisticated light projection techniques.

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El sueño de la razón produce monstruos

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Posted: 20 August 2009 10:31 AM   [ Ignore ]   [ # 35 ]
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I imagine a program similar to Photoshop that would let you use motion images as a filling pattern. Take the female legs as an example: select the legs in the photo (with a magic wand, for example) and apply the pattern of prerecorded “moving arrows.” Is such a program exists (I guess it does), it would be fairly simple to make montage of still and moving images.

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Posted: 20 August 2009 03:37 PM   [ Ignore ]   [ # 36 ]
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It certainly was well named. It IS scintillating!

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Church; where sheep congregate to worship a zombie on a stick that turns into a cracker on Sundays…

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Posted: 29 August 2009 05:36 PM   [ Ignore ]   [ # 37 ]
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About color vision and color blindness…
The book “The Making of the Fittest” by Sean B. Carroll has long explanations on the subjects.  He explains the genetic history of it in humans and other species, from the opsins in the eye cone cells to the variations in the genes to make the opsins, etc.  We humans have pigments sensitive to 3 frequencies of color light and 1 for black and white at night.  His explanation is a very good analysis of the evolutionary history of vision in many species.  It turns out that a few women may actually have genes to produce an color opsin sensitive to a fourth frequency of light!  This is a very good read also if you are interested in the facts supporting the record of evolution.

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Posted: 29 August 2009 11:28 PM   [ Ignore ]   [ # 38 ]
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BruceM - 29 August 2009 05:36 PM

About color vision and color blindness…
The book “The Making of the Fittest” by Sean B. Carroll has long explanations on the subjects.  He explains the genetic history of it in humans and other species, from the opsins in the eye cone cells to the variations in the genes to make the opsins, etc.  We humans have pigments sensitive to 3 frequencies of color light and 1 for black and white at night.  His explanation is a very good analysis of the evolutionary history of vision in many species.  It turns out that a few women may actually have genes to produce an color opsin sensitive to a fourth frequency of light!  This is a very good read also if you are interested in the facts supporting the record of evolution.

Thanks, I’ll look it up!

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Church; where sheep congregate to worship a zombie on a stick that turns into a cracker on Sundays…

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Posted: 30 August 2009 08:45 AM   [ Ignore ]   [ # 39 ]
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Here is another interesting illusion, what amazes me is how simple it is and yet we are still being tricked.

http://www.brainbashers.com/showillusion.asp?66

Stephen

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Posted: 02 December 2009 09:00 AM   [ Ignore ]   [ # 40 ]
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Neat optical illusion HERE as well ... what shade is the diamond?

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El sueño de la razón produce monstruos

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Posted: 02 December 2009 10:53 AM   [ Ignore ]   [ # 41 ]
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dougsmith - 02 December 2009 09:00 AM

Neat optical illusion HERE as well ... what shade is the diamond?

ohh

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Posted: 02 December 2009 06:11 PM   [ Ignore ]   [ # 42 ]
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Saw an article a few days ago where the females of a species of monkey could see red, but the males were color blind to that color.  When they were injected with the gene that females had, about half of the males could then identify red items.  I didn’t pay much attention to it, but if anyone’s interested I’ll try to find it again.

Occam

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Posted: 03 December 2009 09:07 PM   [ Ignore ]   [ # 43 ]
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dougsmith - 02 December 2009 09:00 AM

what shade is the diamond?

All the diamonds are the same colour. But I cheated, I took it to Photoshop—I had to, I couldn’t help it. The reason all the diamonds appear to be shaded differently is due to the bottom of each diamond being slightly darker than the top. A smart trick!

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Posted: 04 December 2009 06:02 AM   [ Ignore ]   [ # 44 ]
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George - 03 December 2009 09:07 PM
dougsmith - 02 December 2009 09:00 AM

what shade is the diamond?

All the diamonds are the same colour. But I cheated, I took it to Photoshop—I had to, I couldn’t help it. The reason all the diamonds appear to be shaded differently is due to the bottom of each diamond being slightly darker than the top. A smart trick!

I was wondering about that, thanks. (I also think the white space at the top makes a difference).

And BTW, I wouldn’t consider it a “cheat”—optical illusions like this one persist even if you know how they work. That shows that visual processing goes on at a level deeper than conscious processing can effect.

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El sueño de la razón produce monstruos

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Posted: 04 December 2009 07:33 AM   [ Ignore ]   [ # 45 ]
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dougsmith - 04 December 2009 06:02 AM

(I also think the white space at the top makes a difference).

Good point.

dougsmith - 04 December 2009 06:02 AM

And BTW, I wouldn’t consider it a “cheat”—optical illusions like this one persist even if you know how they work. That shows that visual processing goes on at a level deeper than conscious processing can effect.

True. The sun still appears to be moving across the sky.  wink

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