phi phenomenon

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Nine blue dots, with an empty space where a tenth dot could fit, arranged in a circle on a light gray gradient background.

Two rows with five blue dots each against a white gradient background. The fourth dot in the top row is a darker blue than the other dots.

phi phenomenon: Media

optical illusion

Videos

Nine blue dots, with an empty space where a tenth dot could fit, arranged in a circle on a light gray gradient background.

What Is the Phi Phenomenon?

Learn from this video how the rapid visual alternation between stationary neighboring...

Video: Encyclopædia Britannica, Inc.

Two rows with five blue dots each against a white gradient background. The fourth dot in the top row is a darker blue than the other dots.

Beta movement

A stationary object (the dark blue dot) appears in a slightly different position...

Video: Encyclopædia Britannica, Inc.