Bijzondere Spiraal

29 juni 2009 | door Margriet Groenevelt | 3 Reacties |

In onderstaande spiraal zijn ‘groen en blauw’ dezelfde kleur! Wanneer je de andere kleuren weghaalt zul je zien dat het klopt. Nog meer verbazingwekkend is dat we een volgende keer weer denken ‘groen en blauw’ te zien. We willen dus graag blijven geloven wat we denken te zien!

Amazing illusion

Via Discover magazine via Akiyoshi Kitaoka

Incredibly, the blue and the green spirals are the same color. From the article:

The orange stripes go through the “green” spiral but not the “blue” one. So without us even knowing it, our brains compare that spiral to the orange stripes, forcing it to think the spiral is green. The magenta stripes make the other part of the spiral look blue, even though they are exactly the same color.

You see embedded spirals, right, of green, pinkish-orange, and blue? Incredibly, the green and the blue spirals are the same color. At first I thought Richard was pulling our collective legs, being a trickster of high magnitude. So I loaded the image in Photoshop and examined the two spirals. In the two squares displayed below, the one on the left is colored using the same color from the blue spiral, and on the right using the green spiral.

green and blue squares

Like I said, incredible! For pedantry sake, the RGB colors in both spirals are 0, 255, 150. So they are mostly green with a solid splash of blue.

The reason they look different colors is because our brain judges the color of an object by comparing it to surrounding colors. In this case, the stripes are not continuous as they appear at first glance. The orange stripes don’t go through the “blue” spiral, and the magenta ones don’t go through the “green” one. Here’s a zoom to make this more clear:

Blue green spirals zoom

See? The orange stripes go through the “green” spiral but not the “blue” one. So without us even knowing it, our brains compare that spiral to the orange stripes, forcing it to think the spiral is green. The magenta stripes make the other part of the spiral look blue, even though they are exactly the same color. If you still don’t believe me, concentrate on the edges of the colored spirals. Where the green hits the magenta it looks bluer to me, and where the blue hits the orange it looks greener. Amazing.

The overall pattern is a spiral shape because our brain likes to fill in missing bits to a pattern. Even though the stripes are not the same color all the way around the spiral , the overlapping spirals makes our brain think they are. The very fact that you have to examine the picture closely to figure out any of this at all shows just how easily we can be fooled.

This is why I tell people over and over again: you cannot trust what you see even with your own eyes. Your eyes are not cameras faithfully taking pictures of absolute truth of all that surrounds you. They have filters, and your brain has to interpret the jangled mess it gets fed. Colors are not what they appear, shapes are not what they appear (that zoomed image above is square, believe it or not), objects are not what they appear.

So the next time someone swears they saw Jesus, or a UFO, or a ghost, show them this picture. What you see in life is absolutely and provably not what you get.

Edit to add: if you like this illusion, then you might want to check out this audio illusion, and this one of a spinning woman’s sillhouette which is one of my all-time favorites.

Al 3 reacties!


  1. Doh! Erg apart, zet ook ff die andere plaatjes op je blog waar er wordt ingezoomd!

    Gr,
    Eelco


  2. Wat gaaf!

    Goed ook dat je vandaag alweer aan het bloggen bent Margriet, ben trots op je haha!

    Succes!

    Tonny


  3. Over het bloggen heb je van ons geen tips meer nodig, daar weet je al alles van ;-) Dat er maar veel moois uit mag komen!

    Greets en tot snel, Sander

Plaats een reactie: