And if shaking your head really fast is, er, problematic, you can also just look at an angle or move away from the screen until the image appears.
Here's an Instructable on how to make your own head-shaking illusions.
(via r/interestingasfuck)
Shake your head to see this image
The Rakotzbrücke devil's bridge creates the illusion of a circle when it is reflected in the water beneath it
The Rakotzbrücke devil's bridge was constructed to create the illusion of a circle when it is reflected in the water beneath it. Check out some stunning images of the optical illusion here. The bridge was commissioned in 1860 by the knight of the local town and is located in Kromlau, Germany's Kromlauer Park. Visitors can… READ THE REST
In this 3D-printed sculpture, how does the ball defy gravity and roll uphill?
I suggest pausing at 15 seconds in to come up with your angle on how you think this works. As MC Escher said, "Are you really sure that a floor can't also be a ceiling?" illustrative front page thumbnail image (cropped): BINK0NTAN/Shutterstock READ THE REST
The bizarre "scintillating grid illusion"
As you scan your eyes over this grid, black dots seem to appear in the periphery of your focus. But they disappear and are replaced by white dots when you look directly at them. Why does it do this? Scientific theories abound, but the real answer is no one knows. READ THE REST
Light up with a pipe that's made to make smoking simple
There's a lot of reasons to buy a new smoking piece. Maybe you dropped your old one and that cool glass octopus build doesn't work so well when it's in a million pieces. Perhaps you're making the switch from rolling your own to something a little less cumbersome. Or maybe you just want an upgrade. Whatever… READ THE REST
Life's hard enough, which is why this flexible lighter is a game-changer
From ensuring you have enough money for gas this week to keeping up with today's politics, life is far from easy. And everyday things like making dinner, commuting to work, and even lighting candles should be the least of your worries. But when it comes to reaching down into the jar of your favorite candle, unable to… READ THE REST
These $29 game design and development courses might make learning as fun as the real thing
Gaming is something that most people can appreciate. Whether you're into the classics, a casual gamer, or a die-hard who plays all the time, there are many different ways to enjoy the hobby. But we think it's safe to say, novice or professional, we're all interested in how games even come to be. If you're fascinated by gaming… READ THE REST
