How to Draw Optical Illusions (Easy Tutorials)
Want to learn how to draw an optical illusion? Start by fooling yourself. Fifteen of the cards are drawings: guess what your eyes are getting wrong, reveal the answer, and all but one of them hands you the pencil steps. The rest are questions about the tricks themselves, six multiple choice, three true or false and three to type, from shading to anamorphic street art. Almost every drawing is straight lines and circles, so the pencil work stays the easy part.
Drawing an optical illusion shows you exactly where the eye is fooled
Every picture card here works the same way: your eye answers before you do. On the two gray squares (card 1) it declares one of them paler. On the converging rails (card 3) it declares the upper bar longer. Say that first answer out loud, then hunt for the one feature in the drawing that produced it, whether it is a dark panel behind a light patch, a pair of rails squeezing together, or a row of tiles nudged half a tile sideways. That feature is also the pencil step you would copy.
The working habit is a physical check, not a harder stare. Cover the two panels with your fingers, lay a straightedge across the interrupted diagonal (card 11), hide the two rings and compare the bare dots (card 13). Seventeen of the eighteen picture cards carry the steps for drawing that illusion inside their reveal, so the check that proves the illusion also hands you the recipe. Card 18, the three near circles, breaks the pattern and offers a checking trick instead.
The nine quiz cards after the pictures ask you to name the mechanism rather than spot it, from the half-tile offset to shading and anamorphic distortion, and the last three ask for the vocabulary. If you would rather just look, the optical illusions gallery next door is built for browsing; this page is built for redrawing.
- Riddle 1: most people say The one on the black background. Sitting on the black panel makes that square look bright, so most readers pick it before they compare anything. Both squares are filled with one value; the only thing that changes is the panel underneath each one.
- Riddle 3: most people say The top bar. The upper bar sits where the rails have already squeezed together, which reads as distance. Something that far off, still covering the same width of paper, would have to be bigger, so your eye enlarges it for you.
- Riddle 8: most people say B, the higher line. B looks like the natural continuation because the eye picks an exit point rather than following the line through, and the upright edges of the bar pull that pick upward. A straightedge laid across the whole figure ends the argument.
- Riddle 15: most people say A, the widest shape. A owns the biggest outline on the card, and size is what most people grade when asked about roundness. Measure A across, then measure it top to bottom: it is wider than it is tall, which rules out a circle.
Name what your eye decided first, then find the line, panel or offset in the drawing that talked it into deciding that.
Easy optical illusion drawings to start with
Classics like the Ponzo rails and the Delboeuf circles need nothing but a ruler, a pencil, and a couple of minutes. Guess the trick first, then steal the technique for your own page.
How to draw optical illusions step by step
Every drawable illusion comes down to one deliberate contradiction, and once you can name the contradiction the drawing gets easy. In the ribbon trick, you rule a set of straight horizontal lines across the page and bend each one upward where it crosses a narrow vertical strip. Nothing is shaded, yet the strip reads as a raised cylinder, because the brain treats curved contour lines as evidence of a rounded surface. The impossible triangle lives entirely in its three corners: each beam has to pass in front of one neighbor and behind the other, so the loop never closes in a way real timber could. Depth itself is cheap to fake. Shade one side of a shape from a single light source, add a soft cast shadow, and a flat doodle lifts off the paper. Separate that shadow from the object and the object seems to hover.
Optical illusion trivia and quick quizzes
The last twelve cards trade the pencil for recall: multiple choice, a few true or false checks, and three type-in stumpers on famous tricks like the Penrose triangle and figure and ground.
-
1. The simultaneous contrast illusion. Two small squares sit on different backgrounds. Which small square is a lighter shade of gray?
Most people first say: The one on the black background
Show answer
Neither. Both gray squares are exactly the same shade. To draw it: pick one gray, then place a copy on a dark panel and another on a light panel. Your eye reads each square against its neighbor, so the gray on black looks brighter than the identical gray on white.
Your eye never measures brightness on its own, it grades every patch against whatever surrounds it. Against the dark panel the ink looks pale, against the pale panel the same ink looks dirty. Cover both panels with two fingers and the match appears.
-
2. The Shepard tabletop illusion. Two tabletops are drawn as parallelograms. One looks long and narrow, the other short and wide. Are the two tabletop shapes actually the same?
Most people first say: No, the left one is longer
Show answer
Yes. The two parallelograms are identical, just rotated. To draw it: make one parallelogram, copy it, and turn the copy about ninety degrees. Your brain reads each shape as a real table seen in depth, so the one pointing away from you looks stretched even though the flat shapes match.
Nothing here is furniture, yet your visual system insists on reading tables in a room and corrects for the depth it invented. Whichever top seems to recede gets stretched along that direction, which is why measuring beats judging.
-
3. The Ponzo illusion. Two bars sit between converging rails. Which bar is longer?
Most people first say: The top bar
Show answer
Neither. Both bars are the same length. Draw two lines converging like train tracks, then place two equal bars across them. The top bar seems farther away, so your brain scales it up. An easy optical illusion art trick that works every time.
Converging rails read as distance, and something far off that still covers this much width would have to be huge, so the upper bar gets quietly enlarged. Slide it down beside its twin and the bonus disappears.
-
4. The Wundt illusion. Two bold vertical lines cross a fan of slanted lines that meet in the middle. Are the two bold lines straight, or do they bow inward?
Most people first say: They bow inward at the middle
Show answer
They are perfectly straight and parallel. To draw it: rule two straight vertical lines, then add a fan of lines behind them that all point to the center. The converging fan tricks your eye into seeing the straight lines pinch inward where the fan is densest.
Where the fan crowds together its angles become the reference your eye grades the verticals against, so the verticals seem to pinch to match. Hold a straightedge along one and the bow is gone on the spot.
-
5. The Necker cube. Which face of this cube is the front?
Most people first say: The lower left face
Show answer
Either one. The cube flips as you stare at it. Draw a square, draw a second square overlapping it up and to the right, then connect the matching corners. With no shading, your brain can't decide which face is closer, so it keeps switching.
The question smuggles in an assumption: that one face has to win. With no shading and no interrupted edge, nothing marks which corner is nearer.
-
6. The Hermann grid. Stare at the white crossings between the squares. What appears?
Most people first say: Nothing, the gaps stay white
Show answer
Ghostly gray dots flicker at the intersections, then vanish when you look straight at them. Draw a grid of dark squares with even gaps. The cells in your retina that handle contrast get confused at the crossings and report dots that don't exist.
A white junction has pale corridor on all four sides, while the corridor between two squares has white on only two, so your eye grades the junction as the darker spot. Side vision pools brightness that widely, the center does not.
-
7. The cafe wall illusion. Are the horizontal lines between the rows parallel?
Most people first say: No, every row slants
Show answer
Yes, perfectly parallel, even though they look like they slope. Draw rows of dark tiles, shift every other row half a tile sideways, and separate the rows with thin lines. The offset tricks the edge detectors in your eyes into seeing wedges.
Each row is shifted half a tile against the one below, and where a dark corner meets a pale gap your eye picks up a tiny wedge. Those small wedges add up along the length of one mortar line.
-
8. The Poggendorff illusion. A diagonal line ducks behind the bar. Which line continues it, A or B?
Most people first say: B, the higher line
Show answer
A. It looks too low, but lay a ruler on it and the alignment is perfect. Draw a wide bar, run a diagonal into one side, then continue it out the other side on the exact same line. Add a decoy exit slightly higher. Almost everyone picks the decoy.
The gap is where the guessing happens. Your eye picks an exit point instead of following the line through, and the two upright edges tug that choice upward. Widen the bar and the error grows with it.
-
9. The Jastrow illusion. Two curved rail pieces. Which one is bigger?
Most people first say: The lower one
Show answer
They're the exact same shape. The lower one only looks bigger. Trace one banana-shaped arc twice, then stack the copies with a slight offset. The short top edge of one sits next to the long bottom edge of the other, so your brain misjudges the sizes.
You compare the pieces where they touch, and there the short inner edge of the top arc lies against the long outer edge of the one below. Swap the two copies and the winner swaps with them.
-
10. The Delboeuf illusion. Which solid inner circle is bigger?
Most people first say: The right one
Show answer
Neither. Both dots are identical. Draw two equal dots, then ring one with a big loose circle and the other with a snug one. The tight ring makes its dot look bigger. Restaurants use this trick with plate sizes.
A dot is graded against its ring, not against the page. The right ring leaves almost no gap, so its dot fills the frame and reads as fat.
-
11. Schroeder's staircase. Are these stairs seen from above, or from underneath?
Most people first say: From above only
Show answer
Both. Stare at it and the staircase flips between a top view and an underside view. Draw a zigzag of steps between two parallel diagonals. Without shading there's no clue about which surface faces up, so your brain alternates between the two readings.
Two readings are offered as though one had to be wrong. Nothing in the drawing says which way is up, no shading, no floor, no ceiling, so the same zigzag serves as treads or as their undersides.
-
12. The classic reversible picture. Do you see a vase, or two faces about to argue?
Most people first say: Only the vase
Show answer
Both are correct. The vase and the two profiles share the same outline. Draw one wavy face profile with a forehead, nose, and chin, then mirror it. Close the top and bottom and the empty space between the faces becomes a vase. Figure and background swap places.
One pair of curves serves two readings, and everything rides on which side of the line your attention calls solid. Treat the space between them as the object and you get pottery, treat the outer sides as solid and two noses appear.
-
13. Is this page bulging out at you, or sinking into a hole?
Most people first say: It sinks into a hole
Show answer
It's completely flat. The shifted circles fake a 3D tunnel. Draw a big circle, then draw each smaller circle slightly lower than the last. The drifting centers read as depth, and the flat page turns into a hole. One of the easiest 3D drawing tricks there is.
Rings drawn around one shared center look like rings. Here each center creeps downward, so the gaps run fat along the top and thin along the bottom, which is what a funnel does when you peer into it at an angle.
-
14. The 3D ribbon trick. Why does the strip in the middle look rounded?
Most people first say: The strip is shaded
Show answer
Because every straight line arches up as it crosses the strip, your brain reads the strip as a raised tube. Rule a set of straight horizontal lines, mark a strip with two faint verticals, and bend each line into a gentle bump inside the strip. This is how the famous 3D hand drawing works too: trace your hand, then bump every line inside the outline.
There is no shading anywhere on this one, and that is what makes it worth copying: bent contour lines on their own are enough to say a surface curves. It is the same evidence that makes a traced hand look inflated.
-
15. One of these three shapes is a perfect circle. Is it A, B, or C?
Most people first say: A, the widest shape
Show answer
B. A is a wide oval and C is a tall oval. Your eyes are surprisingly bad at spotting a true circle next to near-circles. Artists check by turning the page upside down, which resets your judgment.
Roundness is not what most people grade. They grade size, and the biggest outline wins the vote. Compare each width against its own height instead, or tip your head sideways, and the two impostors give themselves up.
-
16. You want to learn how to draw an optical illusion for the first time. Which one should you start with?
Show answer
The 3D ribbon trick with straight lines and bumps
The ribbon trick needs only a ruler and a steady hand: straight lines everywhere, small bumps in the middle. It teaches the core idea that bent lines read as depth.
-
17. In the Muller-Lyer illusion, what actually changes how long each line looks?
Show answer
The direction of the arrow fins on the ends
Outward fins stretch the line in your mind and inward fins squeeze it. Flip the fins and the same line changes apparent length.
-
18. What makes anamorphic street art look like a real 3D hole in the pavement?
Show answer
It's drawn stretched so it only looks right from one viewing spot
The drawing is heavily distorted. From one exact camera angle the distortion cancels out and the scene snaps into 3D.
-
19. Which pencil technique does the most to make a flat drawing look 3D?
Show answer
Shading one side and adding a cast shadow
Light and shadow are the strongest depth cues you can draw. A consistent light source plus a soft cast shadow lifts a shape right off the page.
-
20. Why do the tiles in the cafe wall illusion look slanted?
Show answer
The rows of tiles are shifted and the contrast confuses your edge detection
Every line in it is perfectly straight and level. The half-tile offset between rows creates false wedge signals in your visual system.
-
21. You're drawing the impossible triangle and it isn't working. What's the most likely fix?
Show answer
Make the three corner overlaps connect the wrong beams on purpose
The whole trick is in the corners. Each beam must pass in front of one neighbor and behind the other, which is impossible in real 3D but easy on paper.
-
22. Optical illusions happen in your eyes, not in your brain.
Show answer
False.
Most illusions are created by the brain's shortcuts for judging depth, size, and edges. Your eyes report the scene fine; the interpretation goes sideways.
-
23. The Penrose triangle can be built as a solid object that looks impossible from every angle.
Show answer
False.
Real sculptures of it only work from one exact viewpoint. Step to the side and you see the gap or twist that makes it possible.
-
24. Adding a small shadow under a drawn object makes it look like it floats above the paper.
Show answer
True.
A cast shadow separated from the object is a powerful depth cue. Artists use it to make doodles hover.
-
25. Street art drawn stretched on pavement so it looks 3D from one exact spot is called ___ art.
Most people first say: Isometric art
Show answer
Anamorphic
The word carries the method inside it: ana plus morphe, a shape formed again. The pavement picture is painted wrong on purpose and only reassembles for the single viewpoint the artist measured from, which is why the photograph beats standing there.
-
26. The famous impossible triangle is named after the mathematician family that popularized it in the 1950s. What's the name?
Most people first say: Escher, the artist
Show answer
Penrose
Escher gets the credit because he drew the endless waterfall, but he borrowed the shape. A father and son published it in 1958, and the surname stuck to the beams rather than to any painting.
-
27. In the vase-or-faces picture, the shape you notice is the figure. What do artists call everything behind it, the part your brain ignores?
Most people first say: The foreground
Show answer
The background
Artists work in pairs of terms: figure and ground. The leftover area has its own name, negative space, and treating it as a shape in its own right is what lets one outline carry pottery and two profiles at once.
Your score
FAQ about How to Draw Optical Illusions (Easy Tutorials)
Do I need art skills to draw these optical illusions?
No. Most of the classics here are built from straight lines and simple circles, so a ruler and a pencil cover nearly everything. The drawing tips name the trick behind nearly every illusion on the page, card by card.
What is the easiest optical illusion to draw?
The ribbon strip on card 17. Rule six straight horizontal lines, mark a narrow vertical strip with two faint verticals, then bend each line into a small upward bump inside the strip. The flat page grows a raised tube and nothing is shaded.
Why do optical illusions fool your brain?
Sight is a stack of fast guesses about depth, size and edges, and a drawing can feed those guesses false evidence. Converging rails suggest distance, a snug ring suggests a fat dot, and the guess lands before you can argue with it.
Are these optical illusion drawings good for kids?
Yes, the whole page is family friendly. Kids around eight and up can copy the simpler line illusions, and the short explanation of why each trick fools the brain makes a nice mini science lesson.
Card 18 is the one to remember here: your eye is a fast guesser, not a measuring tool, which is why a straightedge and a spare finger are worth keeping beside the sketchbook. When you want more pictures to argue with, the optical illusions gallery is one click away, and the brain teasers ask for the same slow second look at words instead of lines.