03 Category · Optical Illusions

Optical Illusions

Static images that move, lines that aren't there, and visual tricks your brain refuses to stop falling for. Curated since 2013.

What this is

The Optical Illusions category at BoredomBash collects the working subset of the internet's visual-trickery archive — illusion galleries, perception experiments, classic interactive illusions, and the occasional image that breaks Twitter for a week. Akiyoshi Kitaoka's gallery (the master of motion illusions). The Spinning Dancer (rotates clockwise or counterclockwise depending on which hemisphere of your brain blinks first). The Ames Room (size-distortion famous from photographs). The Café Wall illusion (parallel lines that aren't). Sixteen featured below; the full category contains over thirty. The illusions don't get less effective when you know how they work, which is the genre's whole appeal.

The directory · 16 entries

Hand-picked optical illusions

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Curator's pick

Akiyoshi Kitaoka's Illusion Gallery

Akiyoshi Kitaoka has been our category pick since the directory launched in 2013. Kitaoka is a professor of psychology at Ritsumeikan University in Kyoto who has been creating original optical illusions — primarily motion illusions in static images — since the early 2000s. His "Rotating Snakes" pattern became the most-shared motion illusion on the internet for over a decade. The gallery is hosted on Ritsumeikan's academic web infrastructure (the URL with the tilde and folder structure betrays its 2003 vintage). It's not designed for casual browsing — the interface is deliberately academic, the explanations are technical, and the navigation hasn't been redesigned since the early 2000s. None of that matters because the work is remarkable. The illusions are Kitaoka's original creations. He shows you how the brain is being tricked, then designs new tricks. It is, in our editorial opinion, the canonical optical illusions destination on the internet.

For the 30-second illusion

Best for the 30-second illusion.

For peak immediate impact:

Akiyoshi's Rotating Snakes — static image, snakes appear to rotate.

The Spinning Dancer — rotates clockwise or counterclockwise depending on which way you blink first.

Café Wall illusion — straight lines that aren't.

Hermann Grid — dots that aren't there.

Adelson's Checker Shadow — two squares the same shade. Honest.

For the longer dive

Best for the longer dive.

Michael Bach's Visual Phenomena — proper academic explanations alongside each illusion.

The Illusions Index — curated collection with proper tagging.

Brainbashers Optical Illusions — interactive, dozens of demos.

Magic Eye Test — autostereogram archive (cross-eye to see the dolphin).

McCollough Effect — the side-effect that lasts months.

Related categories

Other rooms of visual trickery

More about this · tap to expand

Editorial criteria What makes a good optical illusion site. Read more

We applied four criteria during the last category sweep.

The illusion still works. Not all illusions translate to a browser equally well. Some require print, some require specific viewing distances, some require a calibrated screen. We test each candidate destination on standard desktop and mobile setups; if the illusion doesn't trigger reliably, the site doesn't make the cut.

There's a real explanation. Junk-tier illusion content typically presents an illusion and explains nothing. The good destinations explain what the brain is doing — the Bayesian-interpretation framing, the visual-cortex shortcut, the perceptual-system limitation. Akiyoshi Kitaoka's gallery and Michael Bach's Visual Phenomena are the canonical examples of this approach.

It's not personality-test slop. A persistent garbage register in the broader illusion space claims that "what you see first reveals your personality." There's no scientific basis for any of these claims. We exclude personality-test illusion sites from the directory regardless of how many social shares they get.

The site is still online. Optical illusion sites have unusually high attrition because many were Flash-based or built on academic-server infrastructure that gets retired when the host professor changes institutions. We do quarterly link checks specifically on this category because of the higher rate of decay.

Cultural context A short history of optical illusions on the internet. Read more

The internet's optical illusion era traces back to the early academic-web 1995-2002 — psychology departments at universities across the US and Europe published illusion galleries on .edu domains as teaching material. Akiyoshi Kitaoka at Ritsumeikan University in Kyoto became the most famous of these — his "Rotating Snakes" illusion (2003) made magazine covers globally and spawned a Twitter career still active in 2026. Michael Bach's Visual Phenomena (2002, ongoing at michaelbach.de/ot/) is the most comprehensive academic illusion gallery still online.

The 2009-2014 viral era brought optical illusions into mainstream attention via specific images that broke the internet. The Spinning Dancer (2003 original, viral 2008) divided people into clockwise and counterclockwise camps. The Dress (2015) — black and blue or white and gold — generated more articles in a week than most genuine news stories. The Café Wall illusion (1979 original, viral several times) became a meme staple.

The 2020s brought generative-AI variants (illusions designed by ML models) and a renewed academic interest in why illusions work. The category at BoredomBash leans toward the canonical lineage — Akiyoshi, Bach, the classic interactive demonstrations — rather than the listicle aggregators that came later.

Editorial standards How we curate. Read more

Quarterly editorial review, nightly bot-tracked link checks, manual review of submissions through /submit/. The category's acceptance rate for new submissions is around 15% — the bar is high because illusion content is also high-volume content-farm territory and most submissions are listicle-style "20 illusions that will blow your mind" pages rather than genuine destination sites. We don't take paid placements. Sites that go offline (a recurring problem in this genre due to academic-host retirement) get retired and replaced. The directory caps at around 25-30 entries because beyond that the curation stops adding signal.

If you liked this If you liked this, try… Read more

Brain Teasers (puzzles and logic challenges that work the same brain-tricking muscle), Weird Websites (visual weirdness specifically — Endless Horse, Falling Falling, Staggering Beauty), and AI Image Generators (for AI-generated illusions which are an emerging subgenre). Outside our directory, Akiyoshi Kitaoka's Twitter feed posts new illusions weekly and is the single best follow for anyone interested in the category. Michael Bach's site is the deepest academic resource.

FAQ · People also ask

Questions about this category.

How do you choose websites for the optical illusions category?

We test each candidate against four criteria: the illusion still works on standard desktop and mobile setups, there's a real scientific explanation (not personality-test slop), the content isn't junk-tier listicle aggregation, and the site is still actively hosted. The acceptance rate is around 15% — the bar is high because illusion content is also high-volume content-farm territory.

How often is the optical illusions category updated?

Quarterly editorial review with monthly link checks specifically on this category — illusion sites have unusually high attrition because many were built on academic-server infrastructure that gets retired when the host professor changes institutions. Around two new sites get added per month on average.

Can I submit an optical illusion site?

Yes — submissions go through /submit/. The illusion category has a slightly lower acceptance rate than most because the bar is high. Tell us what makes the illusion worth seeing in your submission. We auto-reject personality-test illusion sites and listicle aggregators.

What's the most famous optical illusion?

Subjective, but the most-shared illusions across our directory's history are Akiyoshi Kitaoka's Rotating Snakes (motion illusion in a static image), The Spinning Dancer (rotates either way depending on perception), The Dress (the 2015 viral phenomenon), and Adelson's Checker Shadow (two squares are the same shade despite looking very different). The Café Wall illusion has had the longest sustained presence.

Are optical illusions safe to view?

Most are. The exceptions are illusions that involve rapid flashing, strobing patterns, or extreme contrast shifts — these can trigger photosensitive epilepsy in susceptible viewers. Where a destination has flash-warning content, we mark it clearly in the entry tagline. Akiyoshi's Rotating Snakes is reportedly fine for most viewers but a small percentage report mild nausea from the apparent motion.

Why don't optical illusions stop working when I know they're illusions?

Because the visual cortex processes the image before conscious knowledge can override it. Optical illusions exploit shortcuts the brain takes during normal viewing — Bayesian assumptions about perspective, lighting, and motion. When those assumptions are violated by an illusion, the brain still applies them, then conscious reasoning notices the violation but can't undo the perceptual experience. This is why illusions remain effective even after explanation.

Do illusions reveal anything about my personality?

No. Persistent claims that the way you see an ambiguous illusion (Spinning Dancer direction, dress color, etc.) reveals personality traits, dominant brain hemisphere, or psychological state are pseudoscience. There's no peer-reviewed evidence supporting any of these claims. Some illusions show small age-related variations, but those don't extend to personality.

What's the McCollough effect?

A specific illusion where viewing colored grating patterns can produce after-effects that last days, weeks, or even months — long after exposure ends. The effect is unusual because most visual after-effects last seconds. The McCollough effect was discovered in 1965 and remains imperfectly understood. Worth knowing about before you view it; it's the rare illusion with semi-persistent consequences.

Are optical illusions still safe to share at work?

Most are. The static-image illusions (Akiyoshi, Café Wall, Adelson's Checker Shadow, the Spinning Dancer) are quiet, single-tab, and unobtrusive. Avoid Staggering Beauty (flashing lights), the McCollough effect (lasting after-effects you might want to think about), and any illusion site with autoplay audio. The work-safe register is where most of our category lives.

Last updated · May 2026 ← Back to directory