Did you seen the dolphins ?
Maybe you know that faces are more difficult to recognize when they’re upside-down and that sometimes we misperceived the facial expressions of upside-down faces .
But Peter Thompson , from the University of York (UK) discovered an amazing optical illusion !
We can name it The Fat Face Thin illusion. Your assignment is to compare the upside-down face on the left of the lower figure with the upright face on the right. Have you noticed how the upside-down version looks much thinner?! Moreover it appears longer shaped than the upright version. Of course, there is no need to mention how both pictures are identical. This illusion illustrates the internal features of the face (eyes, nose, mouth) can distort our perception of face shape.
Here’s a nice submission. This one was sent in by John Newman, who has seen this type of illusion hundreds of times around the net, but never in real life!
Remember when doing our duty, most of the time we let our thoughts slip by, and before you know it – illusions start appearing in front of our eyes! The thing is… do you see all those gray spots appearing at the white intersections below? They aren’t really there (just so that you know)…
This device creates the illusion that a simple stream of water droplets can defy the known laws of physics. By controlling a set of flickering LEDs, the dripping water can appear to slow down, freeze in mid-air, and even reverse in direction.
This illusion exists because the brain attempts to fill in the gaps between flashes with its anticipated motion. It is the same reason that your brain interprets the 24 frames/second of a movie to be in-motion, rather than recognizing the individual still frames .
It all started when my friend Jesse told me that if you get a strobe light fast enough, you can make it look like dripping water is going in slow motion or even backwards. This phenomenon happens because strobe lights can ‘capture’ an instant in time and allow your eyes to see it as lasting longer than an instant.
So if the strobe light captures consecutive instants of time just out of sync with a periodic occurrence such as dripping water from a faucet, it can appear that the drops are moving slowly or even backwards.
Of course, since we had no strobe light of sufficient speed, Jesse and I never really pursued the concept.