TYWKIWDBI ("Tai-Wiki-Widbee")

This photo was called an "accidental optical illusion" when it was posted at Reddit .  I think that's a very apt descriptio...

An incredible optical illlusion.  I tried covering up the arrow prompts with paper, but the cubes still "move". Sadly I've nev...

What you are looking at is four concentric circles of boxes.  Credit to Baingio Pinna .

Forty of them in eight minutes (many of which I've previously covered in TYWKIWDBI in the optical illusions subcategory ).  Via Neatoram...

Also works nicely in the optical illusions category of the blog , since none of the dots actually move continuously (they just wiggle back a...

... but it's just an optical illusion.  The mother has normal arms.  Look closely. Phocomelia . Via .  Reposted from 2018 because...

For this illusion to be effective, you need to view a gif, and since I've never learned how to embed gifs, I'll just link it here . ...

I checked it myself by selecting a segment from the left of the strip and pasting it on to the right side of the strip.  It disappeared.  Fo...

All four are the same color (not the same color throughout their area, but congruent in terms of color at each point).  Via the opticalillus...

Hard to see close-up, but from a distance [or by "zooming out" on your screen] the dark spaces between the rocks spell "The s...

It's an optical illusion resulting from normal subtractive color mixing.  I double-checked by opening the image in a separate tab, then ...

Other examples of the Best Illusions of 2023 are embedded at Kottke , along with a link to all the competition winners. 

Located in Vienna .

It might help to zoom.  Out.  Via for the image (and the answer) is at Neatorama .

I've posted the abbreviated version of this video; be sure to stick with it to the end to see the full effect.  A longer version of the ...

It does look  like there is a red letter and a red background on the other flag, but those are optical illusions - illustrated with closeups...

The original black-and-white photo has been "colorized" with a criss-cross pattern of colored lines.  There are no solid color are...

The image above was reported and explained at  The Guardian  as a "superior mirage," defined as follows at Wikipedia: "A supe...

Most people will interpret this image as perhaps a door panel; it may take a while to realize that there are actually 16 circles in this pat...