Thought for the day: You can also perceive a Necker cube as having no depth at all, as a hexagon with a weird bow-tie shape inside it. Doesn't that make them *tri*-stable, rather than bi-stable?pic.twitter.com/PhPzkfPY1b
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
Right! For me 'flat' is the dominant percept of this one. With other ones they look 3d first and I have to concentrate to make them seem flat.
Twitter may be over capacity or experiencing a momentary hiccup. Try again or visit Twitter Status for more information.