Chromostereopsis: red in front or blue in frontpic.twitter.com/LVJFIdJ5B9
You can add location information to your Tweets, such as your city or precise location, from the web and via third-party applications. You always have the option to delete your Tweet location history. Learn more
Well that finally did it for me!
Masking the outer part of the visual field abolished the illusion, but I didn't see blue in front. Masking the inner part perhaps made it stronger, although I'm not sure.
Oh wow, I am able to focus on either the red or the blue like they are actually different distances away
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.