Swans on Tea

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8 Mind-Boggling Optical Illusions
Most involving apparent motion.

Missed Kicks Make Brain See Smaller Goal Post
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 [...]

Edge detection
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Pink, green
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 [...]

Clicky

Two-Stroke Apparent motion
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.

These Circles are Round

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1+1 = 3, power of illusion

Cool illusion. Bad Astronomy: The blue and the green
This is why I tell people over and over again: you cannot trust what you see even with your own eyes. Your eyes are not cameras faithfully taking pictures of absolute truth of all that surrounds you. They have filters, and your brain has to interpret [...]