Looks like someone is flying the plane. Double click on the image to view it full size

This optical illusion was submitted by Anh Pham.

Gaze at the black square, you will perceive the red flower reverses after stopping. However when looking at the red flower directly it does not reverse.

Explanation: The flower reverses after stopping because it’s last images still exist in our brain, actually it is “afterimage effect” and plus with peripheral visual system.

This optical illusion was submitted by Anh Pham

Zigzag-patterned disks rotate in opposite directions in an abstract illustration of the illusory motion variety.

This optical illusion was submitted by Mark Grenier.

First look at point A and then to point B. Now see the square and you will feel its moving.

This optical illusion was submitted by Anh Pham

In this illusion, there are two motions:
1. the blue rectangle moves in straight way
2. the background with black and white color rotates in one direction

If you look directly at the blue rectangle, you will perceive it move straight and does not change its color. When you look at the red square, you will perceive it moves in a zigzag way (the direction of the rectangle depends on the current rotation angle of the background) and its color changed brighter when moving in black areas and darker when moving in Grey areas.

The motion of the rectangle and the background create two sources of information.
when we look at the display, we can discern multiple features simultaneously but its quite different when we look at the display peripherally. It is hard for our visual system to analyze sources of information exactly.

The motion of the background is global motion and the motion of the blue rectangle is internal motion. It could be the global motion affects to the internal motion because the global motion has a stronger affection than the internal motion to the peripheral visual system.

There are many illusions only work or work better in peripheral visual system (e.g: lightness illusion, color illusion, contrast illusion, image aftereffect)

In this illusion, the blue rectangle’s color changes is kind of lightness illusion but it only works in peripheral visual system. Sometimes, we are in “passive peripheral visual system”, for example when we look at a moving picture but when we really concentrate look at a point in the picture then whole picture will stop moving.

This optical illusion was submitted by Anh Pham

Look at the moving candle stick, when the red rectangle is coverring it, you perceive it is rolling and changing direction ( counterclockwise and uncounterclokwise) but when the red rectangle is removed you can see it is not rolling.

Explanation: The curvy blue lines make us perceive the candle stick rolls.

This optical illusion was submitted by Anh Pham

Check out and see how this moves

Explanation:

This optical illusion was submitted by Anh Pham

Do you see something unusual in this illusion. Are the balls changing size? Also the background color of this picture is yellow but you perceive the yellow areas between white areas are darker than others.

This optical illusion was submitted by Anh Pham

Gaze at the red square. You will perceive 5 circles are moving similar to how a bicycle pedal moves as you pedal. Now, look at the 5 moving circles, you will perceive they are moving similar to a clock hand. Need a bit practise.

Explanation: the illusion happens when observer switches from foveal to peripheral viewing. When we switch between 2 visual systems, the moving objects sometimes happen in different ways.

Another super illusion by Anh Pham.

In real life the bigger objects appear to move slower than little objects with same speed when viewed by naked eyes. To vertify the speed of an object by naked eyes we often use a point on ground as a stationary point and a point on that object. With big moving object, it is harder to chose an point than little object. In addition, it is harder to realise the distance (space) that big moving objects make per a specific amount of time (seconds, minutes…).

This illusion was submitted by Anh Pham