Watch as this grid repairs itself in the corners of your vision.

What: The Healing Grid illusion is an optical illusion by Scientist Ryota Kanai, and was a finalist in the 2005 illusion of the year competition, with this peripheral trickery.

How To: To get this illusion happening you’ll need to stare into the center, being careful not to look too far to your peripheral vision, eventually there will be a subtle healing of the grid. The effect isn’t staggeringly strong and can take a little while. I find once I’ve got it to heal out once I can replicate it fairly quickly after that.

Explain it: This optical illusion is falling into a similar category to a few on the site, whereby when you’re focusing on a small part of a larger image your brain and optical nerves begin to tire, and start to make a few assumptions about the pereferals. From the paper:

We argue that the uniformity illusion is the result of a reconstruction of sparse visual information (from the periphery) based on more readily available detailed visual information (from the fovea), which gives rise to a rich, but illusory, experience of peripheral vision.

Cites and Extras:

I've researched these optical illusions in my spare time but am clearly not any kind of expert and my explainations are pretty smooth brained, if you find something mis-cited, earlier examples, or general mistakes please new let me know via, be kind!