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Don't believe what your eyes tell you. Thank you, Troxler effect. But focus on the central red or yellow dots and the outer ones reverse to show their true direction — counter-clockwise. That'll be the Troxler effect again. Explanation here. You can't actually make a real Penrose triangle in ordinary space. This is an example of the Ponzo illusion.

Illusions gif

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She'd been bitten and scratched by one of the rats, so some sickness quickly spread through her.

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Optical illusions come in many forms, from horses and tigers to moving shapes and floating ships. They're a fascinating demonstration of how our brain perceives images based on elements like colour, light and surroundings. Optical illusions have been around for centuries and in many different cultures, delighting and confusing people in equal measure, and social media loves them too, with many optical illusions going viral as they baffle millions of people. We've picked out some of our favourite optical illusions of each kind in our round-up of must-see optical illusions below. We've included some classics from the past and some new creations too, all to leave you bewildered and amazed. If you're left wanting more, check out these optical illusions that blew our minds , or if you want to have a go at creating your own illusion, make sure you have a look at our guide on how to download Photoshop so you have the tools to make your own digital designs.

Illusions gif

An optical illusion truly offers something for everyone. Whether you want to entertain a child, or wow a cynic, optical illusions can generally do the trick. In a sense, visual illusions are humbling. They are a gentle reminder of how powerful the mind is. They show you that your reality can be altered by a simple image. An optical illusion can appear in many ways, shapes, and forms. These are classified differently and based on various causes.

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This is an example of the Ponzo illusion. Via moillusions. But focus on the central red or yellow dots and the outer ones reverse to show their true direction — counter-clockwise. This is a variation on the classic spinning dancer illusion. Explanation here. And the cubs aren't all that great either. She'd been bitten and scratched by one of the rats, so some sickness quickly spread through her. So if something is the same size as another object but looks "further away" because of the background, we'll think it's bigger. Thanks, afterimages. I thought it would be a mother and her kits! Published: May 7,

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Already a deviant? Via richardwiseman. The pride moved to a new location that seemed all great and dandy, but there were diseases spreading everywhere, mainly from the colony of rats living there. Yeah, I got dat ;-;. So if something is the same size as another object but looks "further away" because of the background, we'll think it's bigger. But maybe don't operate any heavy machinery for a while. I thought it would be a mother and her kits! Btw, I know I suck at drawing rats. Image size. That'll be the Troxler effect again. VertigoCrime Watch. But Ooooh well! Add to Favourites. But in fact they are always parallel , as you can see when the stripes disappear. Italian psychologist Mario Ponzo suggested that we judge an object's size based on its background.