Look closely and you'll see an infinity symbol in this one. Still can't see it? Try squinting!
The wallpaper version is available at the preceding link.
Today's Gratitude Item: Being given the 'go ahead' to give my class an extension for the project they are working on. There is no way the vast majority of them would have made the deadline and produced high quality work so being able to take a bit more time will be really valuable. I'm hoping that they make the most of the opportunity.