![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi0nT136fnPg7x7kqO9h9nOlpHj68TS7aQ40XZjlPDbcJnyQAI1humSdwlDpUlCjU2nR_PhXrDGrYEY6VYgziB-LRqxnWvybOwnMO3cxBIyBG8hTjqIFzRvAvYthtCYTzIjDNC_9leXifg/s400/blue,+green+spiral+top.gif)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhMYJFa0oNS0lHt5yhGwogfwLlc9BKj7tqOrIbbfd-QL9aSNwrAUXJlYiPh8Z7m-CXhjS9VLXwPB96g3-v8kfO1ePdi_RX1oHwmuqZ_wZRU2e8e6s9ZHJgZI5qHwUc4yS39WnMb5_hDsFc/s400/blue+green+spiral+bottom.gif)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEjxMJ2OZqQ2VNIQyLt0ryILi1MVuy-xNPMRw84Pmc6N4kXbF5O4Amf_BLpvdT4AnDy3HnMcZtV5aAyIst-pXztBEApfztFBWYzRyGmTlLi5gOyBULn6TJHJP3JR3X5R2hij2PecLbnqHFo/s200/blue+green+spiral+inset.jpg)
The reason the spiral arms appear different colors is that when the bluish-green is embedded in purple in looks blue, and when embedded in orange it looks green - as shown in the bottom magnified view.
There is more explanation of this fascinating optical illusion at the Discover Magazine link, and some discussion at Neatorama. Via J-Walk.
Thanks for this. I saw the spiral yesterday and thought it was a hoax. By zooming in and including the RGB codes, it really made it reasonable and real for me. Good work!
ReplyDelete