Shabbos & Yom Tov · Parashat Chayei Sara
Rivka's Well Illusion
Look down into Rivka's well: the rope seems to spiral down to the water, yet every coil is a perfect circle.
See this week’s illusionShabbos & Yom Tov Illusion of the Week →
Original illusions · Real science
Your eyes are lying.
Beautifully.
57 original optical illusions, each drawn from scratch, with the science of why they work, the story of who found them and tricks to reveal the truth.
It looks like a spiral. It isn’t.This week
Next holiday · Thanksgiving · Thursday, November 26, 2026
Thanksgiving Turkey Afterimage
Stare at a blue turkey for 30 seconds and a warm brown turkey with a red, orange and gold tail appears.
Original merch · Printed to order
Shop all designsWear the illusion
34 original illusion designs on tees, hoodies, mugs, posters, puzzles and more, printed to order.
New · Launches December 1, 2026
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Members get fresh benefits every month: new printables, illusion packs and extras for families and classrooms. Plans start at $4.99 a month, and founding members lock in $3.99 a month for life.
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New · Hidden 3D pictures
Stereograms
Six original hidden-picture stereograms with a how-to-view guide, plus Weather 3D, a stereogram that hides today’s forecast for your ZIP code.
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Daily illusion ·
Hermann Grid
Gray smudges flicker at the crossings of a black-and-white grid.
Start here
Motion illusionsPeripheral Drift IllusionWavy bands that slide sideways in the corner of your eye, even though nothing moves.
InteractiveBrightness illusionsCheckerboard Shadow IllusionA dark square in light and a light square in shadow are the same gray.
Impossible & ambiguous figuresImpossible TriangleThree bars meet at right angles to form a triangle that cannot exist.
Brightness illusionsScintillating GridWhite dots on a gray grid seem to flash with black spots.
InteractiveMotion illusionsMotion Aftereffect SpiralWatch a spinning spiral for 30 seconds and still things start to move.
Geometric illusionsCafé Wall IllusionPerfectly parallel rows of tiles that seem to tilt into wedges.Explore by type
Motion illusions7 illusions →Geometric illusions13 illusions →Brightness illusions8 illusions →
Color illusions5 illusions →
Impossible & ambiguous figures8 illusions →Holiday illusions8 illusions →Shabbos & Yom Tov Illusion of the Week2 illusions →Stereograms6 illusions →
Ambiguous figures6 illusions →
Impossible objects3 illusions →
Interactive illusions36 illusions →Test
Take the 20-question optical illusion test
Twenty original illusions, one score out of 20. Most people land between 6 and 12, even when they know they are being tricked. Short on time? Try the 8-question quiz or what do you see first?
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Free optical illusion worksheets
Fifteen easy illusions for kids, a free 9-page printable pack, DIY projects and teaching tips.
Illusions for kidsHoliday 2026 · Gift guide
Optical illusion gifts for curious minds
Books, Magic Eye pictures, impossible puzzles, kaleidoscopes, science kits and our own illusion tees, mugs and activity book: twelve gift ideas for Chanukah, Christmas and beyond.
See the gift guideEvery illusion
Brightness illusionsHermann GridGray smudges flicker at the crossings of a black-and-white grid.
InteractiveBrightness illusionsSimultaneous ContrastA uniform gray bar looks lighter on the left and darker on the right.
InteractiveBrightness illusionsCornsweet IllusionLeft and right halves are the same gray, but the left looks lighter.
Color illusionsMunker-White IllusionThe same pink looks like two colors on blue and yellow stripes.
InteractiveColor illusionsAfterimage FlagStare at a cyan, black and yellow flag and a red, white and blue one appears.Color illusionsWatercolor IllusionA thin orange edge tints a whole white region pale orange.
InteractiveGeometric illusionsMüller-Lyer IllusionThree identical lines that look clearly different in length.Geometric illusionsEbbinghaus IllusionA circle among giants looks small; among dwarfs it looks big.
Geometric illusionsPonzo IllusionTwo equal bars on converging rails look like different lengths.
Geometric illusionsZöllner IllusionShort hatches make long parallel lines seem to tilt toward each other.Geometric illusionsFraser SpiralConcentric circles of twisted cord that look like one big spiral.
Geometric illusionsHering IllusionTwo straight red lines bulge apart over a burst of rays.
Geometric illusionsPoggendorff IllusionA straight diagonal looks misaligned where a bar crosses it.
Geometric illusionsJastrow IllusionTwo identical arcs, but the lower one always looks bigger.
Geometric illusionsKanizsa TriangleA bright white triangle appears from nothing but three cut-out discs.Impossible & ambiguous figuresNecker CubeA wireframe cube that flips between two orientations.
Impossible & ambiguous figuresRubin VaseA golden vase, or two dark profiles facing each other.
Motion illusionsOuchi IllusionA checkered disc that seems to float and slide over its background.
InteractiveMotion illusionsStereokinetic RingsTurning flat circles that suddenly pop out as a cone or tunnel.
InteractiveMotion illusionsTroxler FadingStare at the cross and the soft color spots vanish into gray.InteractiveMotion illusionsMoiré PatternsTwo sets of rings overlap and phantom waves sweep across them.Motion illusionsPinna-Brelstaff RingsMove your head toward the dot and the two rings turn opposite ways.InteractiveImpossible & ambiguous figuresRabbit-Duck IllusionOne drawing, two animals: a duck facing left or a rabbit facing right.
Impossible & ambiguous figuresSchröder StairsA staircase you climb from above or hang beneath from below.
InteractiveImpossible & ambiguous figuresSpinning Dancer IllusionA spinning silhouette that turns clockwise for some people and the other way for others.
InteractiveColor illusionsThe Dress IllusionThe photo that split the internet, and the color science behind it.InteractiveImpossible & ambiguous figuresImpossible CubeA cube frame where one beam passes both in front of and behind another.
InteractiveImpossible & ambiguous figuresDevil's ForkThree round prongs at one end turn into two flat prongs at the other.
InteractiveGeometric illusionsDelboeuf IllusionTwo identical pink circles: a close ring makes one look bigger.
InteractiveGeometric illusionsVertical-Horizontal IllusionAn upside-down T whose two lines are the same length.
InteractiveGeometric illusionsShepard TablesA long table and a wide table with exactly the same tabletop.
InteractiveBrightness illusionsEhrenstein IllusionGaps in a pattern of lines look like glowing white discs.
InteractiveBrightness illusionsMach BandsA smooth ramp from dark to light that grows a dark stripe and a bright stripe.
InteractiveBrightness illusionsChubb IllusionTwo identical textured discs: the one in the busy surround looks washed out.
InteractiveColor illusionsLilac ChaserA ring of lilac blurs where a green dot seems to race around, and then the lilac vanishes.
InteractiveHoliday illusionsChanukah Menorah IllusionEight Chanukah candles that look tall, short, tall, short. Every one is the same height.
InteractiveHoliday illusionsSpinning Dreidel IllusionA dreidel at rest inside rings that seem to turn on their own. Nothing in the picture moves.
InteractiveHoliday illusionsHidden Christmas Tree IllusionA grid full of flashing dark dots, with a Christmas tree hiding in it. Can you spot it?
InteractiveHoliday illusionsChristmas Wrapping Paper IllusionGreen and cream checks on wrapping paper that seem to slope. Every line is perfectly straight.
InteractiveHoliday illusionsKwanzaa Kinara Color IllusionThree candles look red, three look green. All six are the very same color.
InteractiveHoliday illusionsKwanzaa Kinara AfterimageStare at a cyan, white and pink kinara, then see red, black and green candles appear.
InteractiveHoliday illusionsJack-o'-Lantern AfterimageStare at a blue pumpkin for 30 seconds and an orange jack-o'-lantern with a glowing face appears.InteractiveHoliday illusionsThanksgiving Turkey AfterimageStare at a blue turkey for 30 seconds and a warm brown turkey with a red, orange and gold tail appears.Shabbos & Yom Tov Illusion of the WeekRivka's Well IllusionLook down into Rivka's well: the rope seems to spiral down to the water, yet every coil is a perfect circle.
InteractiveShabbos & Yom Tov Illusion of the WeekStar of Vayera IllusionA glowing Star of David shines over Avraham's open tent. Not one of its edges is drawn.InteractiveStereogramsHidden Heart StereogramA plump 3D heart floats in front of a pink and red pattern.
InteractiveStereogramsHidden Star StereogramA five-pointed 3D star hides in a gold and navy pattern.
InteractiveStereogramsHidden Rocket StereogramA 3D rocket with fins and a round window waits in a teal and orange pattern.
InteractiveStereogramsHidden Butterfly StereogramA 3D butterfly with bold wings is hidden in a bright blue and gold pattern.
InteractiveStereogramsHidden Eye StereogramA 3D eye stares back at you from a green and purple pattern.
InteractiveStereogramsHidden Planet StereogramA 3D ringed planet floats in a violet and orange space pattern.Why optical illusions are worth your time
An optical illusion is not a failure of your eyes. It is a glimpse of the clever shortcuts your brain uses every second to turn two small, upside-down, blurry images into a stable, three-dimensional world. Each illusion on Opticalillusions.com isolates one of those shortcuts, whether it is how you judge size from context, how you build edges that are not drawn or how your motion detectors adapt, so you can see it working.
Every image here is original artwork drawn for this site, and every explanation is written in plain English with the current scientific understanding, including the places where scientists still disagree. Start anywhere, press the reveal buttons, and send the ones that get you to a friend.