[xSxY3fj5gVCmvWE]

You can do this any time. Just look at one point for a minute or two. It doesn't take very long to set in. I discovered this by myself back in primary school (christ, imagine how boring the lessons must have been).

It's somewhat difficult to avoid moving your gaze involuntarily, but it's ok if your eyes saccade just a tiny bit once in a while, the effect will still work.

Another interesting thing is that while everything fades to gray, if you offset your vision by a tiny bit, you'll see this weird emboss effect, where edges of objects are strengthened. It's hard to explain, but it somehow kinda makes sense to me in terms of an image transformation:

inputImage - troxlersFadingOffset = gray

inputImageWithTranslation - troxlersFadingOffset = edgeDetection

[vlasev]

I can confirm this as well, discovered in a similar way. For me I notice objects start to fade into grey in the periphery. Another cool thing is that blinking seems to reset it for just a second or so and then things fade back to grey instantly.

[jimmaswell]

> if you offset your vision by a tiny bit, you'll see this weird emboss effect, where edges of objects are strengthened.

That sounds like an FFMPEG stream with dropped keyframes, where you see a solid image then you see the changed parts of the next scene start moving but only the changed parts. It's the same mechanism in a way.

I've spent time staring as still as I can at things and tthis never happened for me. All I get is pulsating and artifacts like floating "invisible lines"