What do you see?

[blowlampParticipant @blowlamp]

I drew this in CAD, looked away and when I looked back, I saw something different.

So what did I draw?

Martin.

 

[Roderick JenkinsParticipant @roderickjenkins93242]

I think you drew a 2 sided angle plate but then my brain flipped to a cube in the corner of a room and now I can’t unsee that!

Rod

[David JuppParticipant @davidjupp51506]

Martin,

I’d check for any settings relating to lighting/illumination for the CAD workspace – adjusting number of lamps might make the interpretation of the scene less prone to ‘flipping’ between possible options.

I can see both options if I try, the ‘cube in the corner’ one is more obvious to me.

Just goes to show that representing a 3D object on a 2D screen does have limitations.

[Mark EasingwoodParticipant @markeasingwood33578]

3 sided angle plate??

I can only see the cube in a corner, until I rotate the lap top and the screen flips between horizontal and vertical format, then I can briefly “see” it.

 

[bernard towersParticipant @bernardtowers37738]

Yes i can see both does it have anything to do with wearing glasses?

[Dave SParticipant @daves59043]

Is it an ‘Innie’ or an ‘Outie’?

Optical illusions are fun

[Michael GilliganParticipant @michaelgilligan61133]

Hypothesis:

Both interpretations are good, but ultimately the ‘cube in a corner’ wins … because the view has an implied ‘ground-plane’ whereas the angle-plate is, un-naturally, free-floating.

Changing the viewpoint will probably flip the interpretation.

 

MichaelG.

[blowlampParticipant @blowlamp]

I drew a three-sided angle plate.

This very short video opens a new tab and shows the transition if you catch it right.

Is there a way to show this Odysee video in the same way as YouTube videos, where they can be viewed without leaving this site?

 

Martin

[bernard towers]

On bernard towers Said:

Yes i can see both does it have anything to do with wearing glasses?

I don’t think so Bernard. I’m not wearing any and can see it.

 

Martin.

[peak4Participant @peak4]

It’s odd for me; I can only easily see a cube sticking out of a corner, but I’m not sure how much that’s influenced by the different colours/shadowing, perhaps illuminated from somewhere around the orange circle.

I feel as though I’m looking down on the object from above where I’ve drawn the red circle.
That being the case, I’d expect the green lines to converge to a distant vanishing point in the direction of the arrows.
In reality, it looks like they diverge

Bill

[John PurdyParticipant @johnpurdy78347]

When I first looked at it it was a cube in a corner, looked away and it became a 3 sided angle plate. Read down through the the posts went back to look at it and it is now a cube in a corner and won’t change. tried changing my viewing angle and the room lighting, still a cube in a corner!

John

[Colin HeseltineParticipant @colinheseltine48622]

I an only see a cube in the corner.  Cannot see angle plate at all.

Colin

[BazyleParticipant @bazyle]

If I cover up all the left except far right corner that bit turns to angle plate. Then I can gradually reveal the rest but it only holds for a second.

[blowlampParticipant @blowlamp]

Try looking ‘up’ at the brown coloured face to see it as a three-sided angle plate and then look ‘down’ at the same face to see it as a cube in the corner.

Martin.

 

[VicParticipant @vic]

I can see a cube in a corner, or an upside down three sided angle plate. Why is the angle plate upside down is my question!?

[Nigel Graham 2Participant @nigelgraham2]

First sighting – angle-box, or a 3-way gusset for a box lid.

Second look – a block standing on a floor, in a corner.

 

Wonderful things, optical illusions are!

[John PurdyParticipant @johnpurdy78347]

Just out of curiosity I loaded it into Picaso and kept rotating it. Every once in a while it would change from the cube to the angle plate then back at unpredictable intervals. I have also found that if I stare at the bottom right hand corner it will change to the angle, look away it’s back to the cube, then stare at the corner again and it’s back to the angle.

John

[larry phelan 1Participant @larryphelan1]

I saw something roundy, I think ???

That might be due to that extra bottle of wine last night !

Too early to be looking at things like that.

[JasonBModerator @jasonb]

It was a cube in a corner until I saw the video where depending on the angle it can also be the angle plate. What doe sit look like if you use perspective rather than orthographic?

 

 

[Nicholas FarrParticipant @nicholasfarr14254]

Hi, I can see both views, but if you are using a mobile, disable screen rotation, and turn your phone clockwise to landscape, and the angle plate is easier to see, and the cube harder to see. (to me anyway)

Regards Nick.

[Nigel Graham 2Participant @nigelgraham2]

Clearly we are all admirers of M.C. Escher’s drawings!

I used to frequent a cafe whose floor was two or three steps up from the pavement, in a street on a gentle hill slope. So if you sat next to the window, you looked slightly down onto the corner of a brick-columned, tile-roofed portico fronting a shop diagonally opposite.

Certain lighting conditions, especially street-lamps on dark Winter evenings, created a peculiar optical illusion giving this portico a peculiar, very Esher-esque form.

 

Sadly the cafe has gone, as the building completely destroyed by a fire several months ago.

 

(It was The Gorge Cafe, and the porticoed shop is Goulds, for them as know Dorchester town centre.)

[JasonB]

On JasonB Said:

It was a cube in a corner until I saw the video where depending on the angle it can also be the angle plate. What does it look like if you use perspective rather than orthographic?

 

It removes the effect for me. Quick video here in a new tab.

 

On Vic Said:

I can see a cube in a corner, or an upside down three sided angle plate. Why is the angle plate upside down is my question!?

No reason, in fact it’s not even an angle plate, it just ‘became’ that during the discussion. It’s actually nothing in particular. 😉

 

Martin.

[Nigel Graham 2Participant @nigelgraham2]

That “nothing in particular” might be a very useful shape for an angle-plate!

[Author]

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