Paradoxymoron

Most involving apparent motion.

The researchers used a small, adjustable replica of a goal post to test players’ perception before and after attempting 10 kicks. While standing in front of the real-life goal, participants were asked to adjust the width and height of the model to scale.

The players’ pre-performance estimations didn’t correlate at all with their subsequent success rate. But after 10 field goal attempts, their perceived goal size was highly correlated with peformance.

Interestingly, the change in players’ perception didn’t just depend on how many goals they missed — it also mattered how they missed their goals. Folks who failed because they didn’t kick high enough perceived the crossbar to be taller, while those who kicked to the side viewed it as more narrow.

There is no spoon green dot. It’s an afterimage from seeing the pink.

Things to add — if you look away, you’ll see green afterimages. Also, if you stare at any of the pink dots for a while, they (or the rest) will still tend to disappear. When you stare at one point, images can fade, especially if they are dim and away from the point at which you are looking, which is a problem in astronomy — you’re looking at a dim star, and it has a tendency to just disappear. This, I’ve learned, is called Troxler’s fading (the wikipedia page uses this illusion as an example). We normally don’t experience this, because we tend to move our eyes a few times per second.

The illusion contains two pattern frames depicting a moving image (hence two-stroke) which are displayed using a technique that creates an impression of continuous forward movement. Any two frames from a motion sequence can be used.