Focus on the cross in the center. Press Start when you're ready.
Describe what you observed in your own words. (This is just for you; I don't record it. But it's helpful to be clear about what you saw.)
There are only two separate dots flashing in sequence — one red, one green. There is no motion. There is no color change mid-flight. If you saw that, your brain constructed it. Run it again to see.
Yet many people perceive a single dot moving from one position to the other, appearing to change color somewhere in the middle of its trajectory. Others might see a third dot of an intermediate color appear out of nowhere in the middle of the trajectory.
Here's what makes this so strange: the second dot hadn't appeared yet when the perceived motion "began." So how did your brain "know" what color to fill in during the perceived movement?
The color phi phenomenon reveals that consciousness is not a live feed. What you experience as "now" is actually a post-produced reconstruction, edited together by your brain to create the illusion of seamless, real-time perception.
We often assume we directly experience the present moment as it happens. This suggests otherwise.