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What caused this optical illusion?
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May 27, 2021 20:52:54   #
hugEDhog Loc: Bear, Delaware
 
This is one of my photos I posted on FB. As I was fiddling with my phone I noticed the effect when you change the angle of view. This was taken on my Fujifilm x100v.


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May 27, 2021 21:17:40   #
Longshadow Loc: Audubon, PA, United States
 
Whoa!

Viewer perception.

The "lower" rim is actually in the back, "top" rim in front.
Great optical illusion. I can see it both ways.
(Not the angle of view, but the perception on one's mind.)

Maybe the reflection in the rear rim?
Try changing it from a bright reflection in the rear rim to a darker reflection and see if that changes your perception.

My neighbor has a bench in his yard facing one direction, If I look at it and think about it, I can see it if it were sitting shifted 90°.

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May 27, 2021 21:34:21   #
hugEDhog Loc: Bear, Delaware
 
Thanks Longshadow for making it less illusory. Just concentrate on the rims, that’s it?

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May 27, 2021 21:34:58   #
Longshadow Loc: Audubon, PA, United States
 
hugEDhog wrote:
Thanks Longshadow for making it less illusory. Just concentrate on the rims, that’s it?

Works for me.

I wonder if everyone sees it as "melted" at first...

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May 27, 2021 21:44:43   #
rmalarz Loc: Tempe, Arizona
 
That's pretty cool. A wine glass that is canted a bit so on doesn't have to tilt it as much to get the last few drops.
--Bob
hugEDhog wrote:
This is one of my photos I posted on FB. As I was fiddling with my phone I noticed the effect when you change the angle of view. This was taken on my Fujifilm x100v.

Reply
May 27, 2021 21:47:26   #
Longshadow Loc: Audubon, PA, United States
 
rmalarz wrote:
That's pretty cool. A wine glass that is canted a bit so on doesn't have to tilt it as much to get the last few drops.
--Bob


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May 27, 2021 22:47:21   #
Curmudgeon Loc: SE Arizona
 
Who cares why. Great shot. Illusion and all

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May 27, 2021 22:59:24   #
Cwilson341 Loc: Central Florida
 
Excellent observation. My eyes keep switching back and forth.

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May 27, 2021 23:08:14   #
robertjerl Loc: Corona, California
 
You are shooting at an upward looking angle so the whole rim can be seen through the clear glass with the far side rim appearing lower, get the camera level or above the level of the rim or use a non transparent goblet and the whole trick effect will go away.

Since I scanned the goblet from top to bottom with my eyes I never got the "trick" until I worked at seeing it. When you look at the near rim first by the time you get to the image of the far rim through the body of the goblet you: a. have the perspective true to life & b. notice the other rim is just not as sharp since you are looking through the near side glass.

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May 28, 2021 00:15:55   #
hugEDhog Loc: Bear, Delaware
 
Thanks robertjerl for a very nice feedback!

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May 28, 2021 01:46:29   #
Charles 46277 Loc: Fulton County, KY
 
rmalarz wrote:
That's pretty cool. A wine glass that is canted a bit so on doesn't have to tilt it as much to get the last few drops.
--Bob


Yes, tilting the glass is such a pain.

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May 28, 2021 02:31:19   #
R.G. Loc: Scotland
 
Longshadow wrote:
....Try changing it from a bright reflection in the rear rim to a darker reflection and see if that changes your perception.....


The reflections and the rim at the rear of the glass are the most vivid part of what we see of the glass, which gives the impression that they must be on the front.

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May 28, 2021 07:26:10   #
kymarto Loc: Portland OR and Milan Italy
 
The fact the the reflections end just at the level of the rim adds a lot to the effect

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May 28, 2021 07:34:44   #
Longshadow Loc: Audubon, PA, United States
 
R.G. wrote:
The reflections and the rim at the rear of the glass are the most vivid part of what we see of the glass, which gives the impression that they must be on the front.


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May 28, 2021 07:52:10   #
GrandmaG Loc: Flat Rock, MI
 
Longshadow wrote:
Whoa!

Viewer perception.

The "lower" rim is actually in the back, "top" rim in front.
Great optical illusion. I can see it both ways.
(Not the angle of view, but the perception on one's mind.)

Maybe the reflection in the rear rim?
Try changing it from a bright reflection in the rear rim to a darker reflection and see if that changes your perception.

My neighbor has a bench in his yard facing one direction, If I look at it and think about it, I can see it if it were sitting shifted 90°.
Whoa! br br Viewer perception. br br The "l... (show quote)


Takes a bit of staring, but I finally could see it both ways. Yes, it looked melted at first glance. Interesting shot. Thanks for sharing.

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