Here are a few neat optical illusions.
1. Multi-colored X?
(via Grand Illusions)
It appears that the X is two different colors, but it's actually made using just one shade of pink.
(more below)
2. Is this a circle?
(via eluzions)
It is indeed.
3. Some classic illusions embedded in an animated video:
Hope you enjoyed these!
[Mainly this is to distract you from the fact that there is no Casual Friday post today. There was a billing problem with our survey provider. I fully expect Casual Fridays to be back next week]
More like this
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Last week's Casual Friday study was inspired by a recently-discovered illusion which showed that sound could influence what people percieve visually.
If you're like many regulars to ScienceBlogs you probably found the cool Purple Nurple optical illusion over at Omni Brain.
Photo: Edmund E. Kasaitis.
It's a little disappointing that this fine site follows the general trend in illusions to follow the crowd and neglect source and background -- at least the original names could be given. The first is a variation of the Munker-White illusion, the second belongs to the angular illusion class (Hering, Orbison or Wundt illusion)... Having vented, chagrin is gone, thank's for listening ;-), best, Michael.
That "Multi-colored X" reminds me of this same-color illusion from Edward H. Adelson at MIT. I literally didn't believe that one when I first saw it. Had to cover up various parts of the screen before I conceded the two areas in question are the same shade. Amazing.