The white circles in this gif travel in a straight line across the diameter of the black circle. In the process, they accelerate toward the center and decelerate away with the velocity of a swinging pendulum.
Here's another colorful illusion with the same pendulum movement of the circles:
Warning: staring at the gifs too long may cause flashbacks to playing Tempest:
I chanced upon Sheldon Ebbeler’s hand-drawn fractals, and now plan on tattooing my entire torso, leaving only a tattered self-similar void around the navel.
Flatland is a novel by Edwin Abbott Abbott, published in 1884. It’s written as a biography by “A. Square,” a two-dimensional creature who is literally a living square, thinner than a sheet of paper. He lives with other two-dimensional creatures on a surface called Flatland. In the book, Mr. Square tells of his adventures in […]
In a delightful short video, Klara Sjöberg demonstrates the extreme and alarming freakout that you can trigger in a mechanical calculator by trying to divide a number by zero; in a followup, Lynn Grant tweets "That is why the old Friden calculators had a 'Divide Stop' key."
They might be the shiny new thing, but AirPods aren’t for everybody. Maybe you’re looking for a new sound or you understandably lost those tiny buds during a brisk run. If so, here’s 10 headphones and earbuds that break out of the Apple mode with a return to quality and wearability. Klipsch R5 Bluetooth Neckband […]
When it comes to passwords, there’s no such thing as paranoia. You want them secure and complex, and you definitely don’t want to repeat them on all your accounts. The trouble is, the internet seems to keep growing. And so do those accounts. Just one lockout from an important email or banking site is enough […]
With the rising temperatures on tap this summer, the climate is going to be a frequent topic of conversation, and those conversations won’t be happy ones. Luckily, there’s a way to do a little climate change of your own – in a safe and sustainable way. When it comes to personal air conditioners, EvaPolar is […]