Change Blindness
Hunt for the one thing changing in a street scene, then watch it become obvious the moment the blank between frames is removed.
Showcase
Twelve interactives, each built around one hard idea.
Examples from the founder's Open Psychology Interactives collection, not customer commissions. Code is MIT licensed; content is CC BY 4.0 where marked.
Why It Is Called Least Squares
Drag a line by hand while every residual is drawn as a literal square, and try to beat the total the arithmetic would have chosen.
Stroop Interference Laboratory
Name the ink colour rather than the word, and produce your own reaction-time evidence for an effect you can feel happening.
Where the Cut Is
Break a routed signal pathway at one point, predict the failure it causes, then work backwards from a pattern to where the damage must be.
Four People, One Score
Four colleagues hold an identical stated attitude and behave differently; move one condition and watch behaviour shift while the attitude does not.
Chasing Alpha
Add near-duplicate questions to a scale and watch its reliability score climb while its ability to predict anything quietly falls.
What r Cannot See
Drag a single observation and watch the correlation swing, then change the units and watch the same number refuse to move.
Decision Framing Laboratory
Commit to four decisions about stock at risk, two framed as gains and two as losses, before finding out they were the same choice.
Confound Detective
Classify the variables in a flawed study, repair the design, and watch the estimated effect move back towards the truth you were shown.
Central Limit Theorem Simulator
Draw repeated samples from a skewed or bimodal population and build the distribution of the mean from your own runs.
Where the File Stops
Commit to an explanation for a struggling team as evidence arrives, then spend a fixed budget and see what your choice leaves untouched.
Two Things Called Attention
Resolve an ambiguous pronoun yourself, then compute a transformer's attention weights by hand over the same sentence.