The most amazing optical illusion I ever saw!

^ Of course. The parts of the spiral that appear to be blue/green are actually the same (greenish) color, but that color looks much greener to our brain if you put it next to orange bars, as opposed to purple bars. LCDs/CRTs use subtractive RGB color models, and in those orange is composed of red and green, while purple is composed of red and blue. It makes sense ... orange makes the bar next to it look greener compared to purple, which makes the bar next to it more blue.

Well that's true there not colors...technically shades of grey I believe

@Mike: all knowledge is subjective (which doesn't make it more reliable than it is). Even the fact of you stating that the colour is the same is an aplication of your subjective preference for the notions of "objective realities". Of course that doesn't mean I don't agree with you about the colour. What's important to me though is that the colour looks in two different ways, and I'm basing my rational judgements on this perception, which I found more down to earth and "realistic" than keeping in mind that the colour is actually not what it looks like.

@Henry: having a good sense of relativity (in an epistemological way, not ethical) actually gives one a better grip to the actual world.

A and B are the same color.

yes, but an illusion is subjective, the image itself remains objective. There's no denying that the color is constant throughout the image

Mr ProgFreak wrote: Very nice! This one is quite nice, too: (It's actually the album cover of an album released this year, click the image for the vinyl edition)

Oh god, I hate that one. It's so freaky maaaaaaaaaan
And gives me a headache

yeah, but the green and blue are actually just a shade of turquoise IN FACT, so your semantics still don't apply


very cool effect though!

harmonium.ro wrote: I can cleary see the blue and green are blue and green. However, it may indeed be an optical manipulation: maybe, an effect of the complementarity contrast?

Seeing the blue and green as blue and green IS the illusion. They're actually the same color.

Explanations were offered above.


Edited by Ricochet - June 26 2009 at 15:43

I can cleary see the blue and green are blue and green. However, it may indeed be an optical manipulation: maybe, an effect of the complementarity contrast?