You won’t believe these 3-D illusions!

Just to wake you up with clickbait, and to please Matthew, who loves optical illusions, here are three flat things that look like 3-dimensional things. (You can see more at Distractify).





  1. rickflick
    Posted June 12, 2016 at 8:54 am | Permalink

    You’re right. I don’t believe it. (But then, I’m a trained skeptic).

    • nurnord
      Posted June 12, 2016 at 9:07 am | Permalink

      Apparently, a poor skeptic, given that these illusions are easy to investigate and conclude they are REAL !!!

      • rickflick
        Posted June 12, 2016 at 7:21 pm | Permalink

        Real is as real does.

  2. BobTerrace
    Posted June 12, 2016 at 9:12 am | Permalink

    Technically, every picture that you see that depics a 3-D image and makes you think something is in 3-D, is an illusion.

  3. Torbjörn Larsson
    Posted June 12, 2016 at 10:01 am | Permalink

    You won’t flat out believe this! … um, wait.

  4. Posted June 12, 2016 at 10:55 am | Permalink

    The car driving through the barrier is especially cool.

    • gravelinspector-Aidan
      Posted June 12, 2016 at 3:46 pm | Permalink

      … despite having been shot a little too early (or late) for the painting. (The “verticals” of the “bollards” and the verticals of the wall corners should be parallel.) It’s only … I guess less than a quarter-hour discrepancy, but it’s there.
      Ah, there’s a change in the surface’s camber. That complicates matters.

  5. jaxkayaker
    Posted June 12, 2016 at 11:49 am | Permalink

    I have used optical illusions to illustrate to students the importance of scientific skepticism and not taking things at face value. I especially like these.

  6. cornbread_r2
    Posted June 12, 2016 at 12:35 pm | Permalink

    I had first-hand experience of something like these when I slammed on my brakes at high speed to avoid taking out my vehicle’s undercarriage by a faux cattle guard that had been painted across a Montana highway.

    • gravelinspector-Aidan
      Posted June 12, 2016 at 3:51 pm | Permalink

      I’d never heard of “virtual” cattle grids until now.

      • Posted June 12, 2016 at 5:43 pm | Permalink

        Common in many Western states. I’ve often wondered why the cattle stay fooled by them.

        • gravelinspector-Aidan
          Posted June 12, 2016 at 6:26 pm | Permalink

          It’s a good question.
          Given the cost advantages (I’ve had a non-virtual cattle grid pole break under me – they do rust and require regular maintenance), I’m slightly surprised I’ve never seen one in Britain. Or maybe British livestock simply see past the illusion.
          It’s a good question.

          • rickflick
            Posted June 12, 2016 at 7:21 pm | Permalink

            The Brits do seem to see past many illusions, re: Win/Gallup International.

            • Posted June 12, 2016 at 7:35 pm | Permalink

              Ha. We gullible Americans–even our cattle can’t figure out the difference between fact and fiction (faith).

          • infiniteimprobabilit
            Posted June 12, 2016 at 11:04 pm | Permalink

            I would have thought the imitation painted ones would require even more maintenance – wouldn’t the paint wear off quite fast?


            • gravelinspector-Aidan
              Posted June 13, 2016 at 7:30 am | Permalink

              More frequent. But since there are no structural considerations to the paint … it could go either way.
              The commonest way of building them in the UK is to rest scaffold poles on brick piers across the floor of the pit. So, the piers need adequate foundations ; the bricks are probably adequate for their compressive loads ; but the poles suffer bending loads depending on where the vehicle crosses. After a few years, the galvanizing on the poles can look fine, but the pole collapse under the weight of a person stepping on them. At which point the land-owner has potentially a significant liability problem. (In my case, I felt it going, so suffered no more than surprise, and told the farmer about it over a pint in T’Brass Cat that evening. But he still needed to fix it.)

              • infiniteimprobabilit
                Posted June 13, 2016 at 7:41 am | Permalink

                Here they quite often seem to use old railway rails. Which are of course much stronger in bending than tubes (scaffold poles) and probably weather rust better too.

                Besides, paint loses its effectiveness when covered in a layer of mud, and never works on gravel roads.

                What they do use, quite often, are strips of woven fabric about 6″ wide laid across the road, incorporating wires and hooked up to an electric fence machine. The cows know not to step on it. They could very easily step over it but presumably they’re too dumb to figure that out. (Pigs would though).


              • gravelinspector-Aidan
                Posted June 13, 2016 at 7:53 am | Permalink

                Lengths of railway rail were popular though the 1960s and 70s. Beeching cuts made them available. They’re an expensive rarity these days.

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