You are fooled constantly. Mostly by your own head.
Three departments, 14 pieces, and tools that work in the page: eight illusions that prove themselves, a metadata reader that never uploads your file, and the case file of people who did it on purpose.
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Your eyes
Nobody is deceiving you. Your brain is guessing, and the guess is usually right.
Perception is a prediction, not a recording. Illusions are what a very good shortcut looks like when you catch it out.
4 pieces -
Your feed
Machine-made media, and what actually survives as evidence.
The tells that still work, the ones that stopped working, and why the tools that claim to detect this are worse than useless.
5 pieces -
Their nerve
People who fooled the world on purpose, and got away with it for years.
Forgers, impostors and one chess-playing machine with a man folded inside it.
5 pieces
Your eyes
Eight ways your brain guesses wrong
Nobody is deceiving you here. Each of these is drawn to exact measurements — press Prove it and the page shows you the measurement.
Müller-Lyer
The two lines are the same length.
Outward fins read as a near corner, inward fins as a far one. Your brain corrects for distance it has not been given, and stretches the “far” line.
Ebbinghaus
Both centre discs have the same radius.
Size is judged against neighbours, never in absolute terms. Surround something with giants and it shrinks.
Simultaneous contrast
Both squares are the exact same grey.
The proof joins them with a bar of that same grey. Your visual system reports relationships, not absolute brightness — which is what lets you recognise a white shirt indoors and at noon.
Café wall
Every mortar line is perfectly horizontal.
Offsetting alternate rows makes the grey lines appear to wedge. Named after a café in Bristol whose tiling did exactly this to passers-by.
Ponzo
Both bars are 68 units wide.
Converging lines read as depth, like a road going away. Anything higher up must be further off, so your brain scales it up. The same mechanism inflates the moon on the horizon.
Zöllner
The five long lines are parallel.
Short crossing strokes tilt the whole line in your reading of it. Orientation is computed locally first, and the local answer wins.
Kanizsa triangle
There is no triangle. Nothing is drawn between the discs.
You see edges, and the middle looks brighter than the page around it. Given three notches, the cheapest explanation is a shape on top — so one is supplied.
Vertical–horizontal
Both bars are 80 units long.
Vertical extents read as larger than horizontal ones. It is why a glass looks like it holds more than the same volume in a wide bowl, and why bartenders use tall glasses.
Your feed
What still gives it away
Most of the advice people repeat stopped working two model generations ago. Pick a medium.
Still worth checking
Stop repeating this
Tool
What is inside your image file
Drop a photo. The page reads its metadata in your browser and shows you what a journalist would look at first. Nothing is uploaded anywhere.
Absent metadata proves nothing. Every social platform strips EXIF on upload, so a screenshot of a genuine photograph looks exactly as bare as a generated one. Presence is evidence; absence is not.
Their nerve
The case file
Sorted by method, not by date. The same four moves keep working, three centuries apart.