Rabbits love getting stroked on their nose pic.twitter.com/aYOZGAY6kP— Dan Quintana (@dsquintana) August 18, 2019
His name is Mischief.
By changing the luminance around the edges of the diamond and the background, you can make it look as though the diamond is moving up, down, right, or left. From a paper in i-Perception titled, "The Perpetual Diamond: Contrast Reversals Along Thin Edges Create the Appearance of Motion in Objects." by Oliver J. Flynn and Arthur G. Shapiro. Read the rest
When this curious contraption is switched on, an inner circle of white balls appears to be rolling inside the outer circle, but that's actually not the case at all. Below is a video explaining this circular motion illusion. Learn more about the mathematics behind it, specifically Copernicus’ Theorem, and the ingenious hypocycloid mechanical gear design by Girolamo Cardano (1501-1576) over at The Kid Should See This.
In this video, Caltech demonstrates the Rabbit Illusion, a "time-traveling illusion trick." It tricked me.
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Caltech researchers have developed these two new illusions that reveal how the senses can influence each other—in particular, how sound can give rise to visual illusions. These illusions occur so quickly that they illustrate a phenomenon called postdiction (as opposed to prediction) in which a stimulus that occurs later can retroactively affect our perceptions of an earlier event.
Steve Mould offers a couple of explanations for the flashed face distortion effect. I've seen this before and it's very strange. When you put pictures of two different people side-by-side and flash several pairs, the faces look like gross caricatures. By way of explaining it, he also presents a couple of other cool visual effects. Read the rest
Spatial frequency means how often things change in space. High spatial frequency changes means lots of small detail. Spatial frequency is surprisingly important to our visual system – lots of basic features of the visual world, like orientation or motion, are processed first according to which spatial frequency the information is available at...
Spatial frequency is also why, when you’re flying over the ocean, you can see waves which appear not to move. Although your vision is sensitive enough to see the wave, the motion sensitive part of your visual system isn’t as good at the fine spatial frequencies – which creates a natural illusion of static waves.
See Einstein below? Now go a few steps back from your screen and look again: