Visual illusions are deceptive. Image organization, color effects, light source effects, and other factors can cause many false visual effects.
If you've struggled to see the concealed image in a single-image stereogram, you may have found that optical illusions affect people differently. In some illusions, some people cannot see it.
We see things that aren't there, like the Hermann Grid illusion. Notice how the center dots of each intersection change from white to gray? This optical illusion has various hypotheses about why it happens.
A few years ago, blogs and websites promoted the illusion as a test for "left-brained or right-brained." Our brains try to create space around the spinning image, creating the illusion.
Would you be shocked if the two people on the left are the same size?6 The Ames chamber illusion is used in The Lord of the Rings. Trapezoidal room shape creates the Ames room illusion. Viewers see it as a square room, distorting its size. The small figure is standing farther away than the large figure.
Objects appear closer as you move away. As a road or train goes away, its borders appear to converge.
Like the Zollner illusion, an image's background can affect how your brain understands it. If you stare at this illusion too long, you may feel queasy! Shorter lines may angle differently than long lines. The brain perceives depth when none exists.
The Kanizsa triangle is an optical illusion that shows a triangle that does not exist. Brains fill in gaps to perceive a more complete whole.
This old deception still fools many. Which line stretches farther? Actually, both lines are the same length. This is the Muller-Lyer Illusion. Several theories have been given for its operation.
The moon illusion, in which the moon seems larger on the horizon than higher up, is well-known among night sky watchers. This happens why? Although several hypotheses exist, none are universally accepted.15 The moon's relationship to foreground figures affects distance judgments.
In the lilac chaser illusion, many visual phenomena appear throughout 30 seconds. The illusion was first described in 200516 and is generated by negative afterimages and Troxler fading.
Negative afterimages can create surprising visual illusions like the negative photo illusion. The negative photo illusion involves your brain and visual system turning a negative image into a full-color photo.