Mystery of Shadows in Light - Help Solve the Puzzle!

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Discussion Overview

The discussion revolves around the phenomenon of shadows and light observed through a partially open door. Participants explore the possible explanations for the visual effect, considering concepts from physics, particularly related to light behavior and shadow formation. The scope includes conceptual reasoning and exploratory analysis of the situation described by the original poster.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • The original poster describes a visual phenomenon involving light and shadows, expressing uncertainty about the cause.
  • One participant suggests the presence of two light sources, proposing that the narrow door opening might act like a slit camera, creating a pattern of light and dark.
  • Another participant agrees that the light source is the sun and mentions a single pane window, but doubts that a pinhole camera effect is responsible for the sharpness of the shadow.
  • A participant emphasizes the need for more information about the room's layout to determine the cause of the observed effect.
  • Several participants request a floor plan to better understand the spatial relationship between the door and window.
  • One participant humorously comments on the difficulty of capturing the entire room in a photo while maintaining scale.
  • Another participant suggests experimenting with the door gap to observe variations in the shadow.

Areas of Agreement / Disagreement

Participants express differing views on the cause of the shadow, with no consensus reached. Some propose multiple light sources and camera-like effects, while others question these interpretations. The discussion remains unresolved.

Contextual Notes

The discussion lacks specific details about the room's dimensions and the exact nature of the light sources, which may affect the interpretations presented.

Chrono_13
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So I wake up this morning and find this on my floor, peeking out from a door cracked open. Now I’m not scientist but I’m not unfamiliar with the simple workings of physics. I can’t quite pin down what is going on here. I’m familiar with how light can bend around things and I considered the possibility what I could be seeing here is just light reflecting off the white walls of the room inside.

Both possibilities just didn’t feel completely right.

Ahh how simple things in life can be so confounding… I'd appreciate it if someone can help me understand what I'm seeing here.
 

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Hi Chrono, :welcome:

My best guess is there are two light sources at the other side of the door: a window with a stile, or a door and a window.
Hve you ever heard of a pinhole camera ?
Here the narrow door opening might function as a slit camera: not a 2d picture as with the pinhole, but a 1d light/dark stripes pattern.
 
The light source is the sun, and it’s a single pane window in the room. I am a little familiar with pinhole cameras though I don’t believe that’s what happening here. I’m familiar with the “folding” effect light can have when it gets bent and it makes it appear to create shadows by contrast. But this dark spot is so sharp I can’t explain it with that reasoning.
 
Without knowing the details of your door and room, we can't say for certain what's causing it.
 
Chrono_13 said:
The light source is the sun, and it’s a single pane window in the room.

draw a floor plan of your room showing window, door where on the floor this image is in relation to those 2 things

make sure everything is orientated correctlyDave
 
davenn said:
draw a floor plan of your room showing window, door where on the floor this image is in relation to those 2 things

And it better be straight lines and to scale, or he's getting points taken off!
 
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Drakkith said:
And it better be straight lines and to scale, or he's getting points taken off!

hahaha

I was thinking photo, but may be difficult to get whole room in unless a wide angle lens is used and scale would then be shocking haha
D
 
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Is it just me but I don't see anything unusual in the photo. Try opening any closing the gap in the door to see how it varies.
 

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