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  #151  
Old 02-23-2019, 11:34 AM
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Default Re: Optical illusions

Andrew Lipson made a whole series of 'impossible' Lego builds.

Here's one example - a Lego version of Escher's Ascending and Descending





...and how he did it.

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  #152  
Old 03-04-2019, 10:24 PM
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Default Re: Optical illusions

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  #153  
Old 03-09-2019, 02:09 PM
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Default Re: Optical illusions

Some people can't see the upside-down plates. This one might work for them - it's the same uncropped image rotated ninety degrees both ways.

People are used to illumination coming from above - not from below; so when the scene is illuminated from below, one's brain is inclined to flip the image inside-out to make it better match with the 'usual' illumination.

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  #154  
Old 04-28-2019, 11:32 PM
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Default Re: Optical illusions

Shake your head to see this image / Boing Boing
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  #155  
Old 04-29-2019, 03:02 AM
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Default Re: Optical illusions

After looking at the instruction page, I think my brain has melted, I can feel it dripping out of my eye sockets.
https://www.instructables.com/id/Hid...ical-Illusion/

Also if you don't want to shake your head, step back far enough from the screen so you're not resolving the lines as well and the secondary image will show through.
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  #156  
Old 05-06-2019, 06:41 PM
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Default Re: Optical illusions

Is it an optical illusion when the image is actually there? I can see it both close and far, the contrast is good enough on my monitor.
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  #157  
Old 06-20-2019, 11:18 PM
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Default Re: Optical illusions

nm, not actually
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  #158  
Old 06-21-2019, 12:47 AM
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Default Re: Optical illusions

it must have been an illusion
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  #159  
Old 06-21-2019, 09:07 AM
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Default Re: Optical illusions

nothing to see here
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Old 07-01-2019, 07:42 AM
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  #161  
Old 07-01-2019, 07:46 AM
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Default Re: Optical illusions

I do like that clip.
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  #162  
Old 08-15-2019, 07:45 AM
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Default Re: Optical illusions



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  #163  
Old 08-16-2019, 01:27 AM
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Default Re: Optical illusions

Again, is this really an illusion? You add color, now there's color. It doesn't add color to anything you didn't add color to, like the turtle.
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  #164  
Old 08-16-2019, 01:44 AM
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Default Re: Optical illusions

It's almost the same thing as a newspaper print or a TV screen.
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  #165  
Old 08-16-2019, 01:51 AM
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Default Re: Optical illusions

The effect isn't so strong on my desktop monitor, but when I've seen this pic on my phone, it straight-up looks like a full-color photo unless I zoom way the fuck in. It's especially noticeable in the people's skins, I don't see gray at all, I see a for real human-style flesh tone.
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  #166  
Old 08-16-2019, 02:19 AM
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Default Re: Optical illusions

Well, it is just a colour photo. It's just "dithered" by putting all the colour in the stripes.

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  #167  
Old 08-16-2019, 04:31 AM
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Default Re: Optical illusions

First time I saw it was on a smaller screen, and although I could see the grid lines, I still believed the photo underneath was a normal colour one - until I read the spoiler and checked.

Of course, the colour receptors in our retinas are much more spaced apart than the non-colour ones, and there are very few colour receptors away from the centre of our field of view - so our brains are always dealing with high resolution monochrome images with a much lower resolution colour overlay - this image just helps reveal that in a somewhat surprising way.

If it's not working for you, try squinting a bit, or standing further away from the screen.
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  #168  
Old 08-16-2019, 05:39 AM
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Default Re: Optical illusions

There's also a link right in that picture, so instead of myself running off at the mouth about luminance, chrominance, JPEG and all that other jazz, linkypoo
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