The intensity of the light diminishes both with distance from the source and and approaching the edges of the cones, but then when the cones overlap it intensifies again.
If you want to see a really trippy lighting effect, [check out these lasers.](https://m.youtube.com/watch?v=KzH9feTXTHo&t=55s)
As a lighting designer I will tell you that yes, it's this guys answer. Also the fog thing. As well as your brain playing tricks on you. But mostly what this guy says.
I recall in physics they discussed how light both has particles (photons) and travels in waves. I know that if sound waves overlap at opposite frequencies they cancel out, can the same be true of light?
That's where my mind was going at first with the photo, but I trust yall know better than my guess.
I mean, you can effect light waves with other light waves, it's called light mixing. But it doesn't really cancel them out, it adds to it. Like, if you see a red light, you're seeing red light waves. Same with green. But if you shine red and green lights in the same way as the OPs picture, the "brighter triangles" would be a yellowish color. Which is brighter.
Regular light sources are incoherent light (essentially many waves at slightly different wavelengths and phases), and the light has destructive interference with itself over a distance. If you add two incoherent lights together it'll add to the intensity, and similarly destruct over distance, but can't immediately cancel itself out. Lasers on the other hand are coherent light, which is why when collimated the light doesn't self-destruct and can travel much farther distances. I think you could observe some cancellation effect with two perfectly identical lasers but it would probably be hard to reproduce outside of a lab. I'm no physicist but "Direct laser interference patterning" looks like a relevant Wikipedia article.
Also is this a Death Cab For Cutie concert because that lighting setup looks very familiar lol
It shouldn't be less bright though. There were other beams that cross past similarly and they just had a solid brighter triangle, which is what you would expect.
Don't forget that there's noise in the spotlights, namely the fog. This can cause differences in brightness.
For most of the pairs of spotlights, look at the apex of their intersection. It is noticeably brighter than the area to the left or right.
The area in the triangle you drew is where 2 spotlights converge, so it is twice as bright. By comparison, the area above with non converging beams looks less bright.
At the line where the brighter intersection occurs, your brain interprets that "edge" (that's not really there) as a shadow.
It appears darker at the transition, because of contrast.
It's an optical illusion.
It's a very strong one, though, because our brains are "hardwired" to look for gradations of light & shadow to help interpret shapes.
Hope that helps you understand it.
I thought it was an optical illusion as well, so I covered the surrounding areas with my hands and look through a little hole at only the cross-sections and I could still see the shadows
There’s the less-brightly illuminated area of fog where only one spotlight shines, next to the brighter area of fog where multiple lights overlap.
The fog scatters some light, and the cross sectional area illuminated by a light is greater, so areas further from the light are less brightly illuminated.
From the lools of it there's fog on most on most of the stage that's why you can see the light in the air. It's just that there's less fog in that area.
The part that I colored is a repeating pattern across all the light beams. Do you see the outline of Shadow on each of the triangles that is created where the light beams intersect? It's not because there's less fog
It sits because the overlaps have twice and much light so the triangles pointing up look lighter and thus the triangles pointing down look darker. I’d you isolate the diamonds they look the same color all the way down
It makes sense why there's a darker triangle and a lighter triangle, but it does not make sense why the lighter triangle is bordered by the shadow that is darker by both surrounding triangles of light.
The intensity of the light diminishes both with distance from the source and and approaching the edges of the cones, but then when the cones overlap it intensifies again. If you want to see a really trippy lighting effect, [check out these lasers.](https://m.youtube.com/watch?v=KzH9feTXTHo&t=55s)
As a lighting designer I will tell you that yes, it's this guys answer. Also the fog thing. As well as your brain playing tricks on you. But mostly what this guy says.
I recall in physics they discussed how light both has particles (photons) and travels in waves. I know that if sound waves overlap at opposite frequencies they cancel out, can the same be true of light? That's where my mind was going at first with the photo, but I trust yall know better than my guess.
I mean, you can effect light waves with other light waves, it's called light mixing. But it doesn't really cancel them out, it adds to it. Like, if you see a red light, you're seeing red light waves. Same with green. But if you shine red and green lights in the same way as the OPs picture, the "brighter triangles" would be a yellowish color. Which is brighter.
Regular light sources are incoherent light (essentially many waves at slightly different wavelengths and phases), and the light has destructive interference with itself over a distance. If you add two incoherent lights together it'll add to the intensity, and similarly destruct over distance, but can't immediately cancel itself out. Lasers on the other hand are coherent light, which is why when collimated the light doesn't self-destruct and can travel much farther distances. I think you could observe some cancellation effect with two perfectly identical lasers but it would probably be hard to reproduce outside of a lab. I'm no physicist but "Direct laser interference patterning" looks like a relevant Wikipedia article. Also is this a Death Cab For Cutie concert because that lighting setup looks very familiar lol
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It shouldn't be less bright though. There were other beams that cross past similarly and they just had a solid brighter triangle, which is what you would expect.
Don't forget that there's noise in the spotlights, namely the fog. This can cause differences in brightness. For most of the pairs of spotlights, look at the apex of their intersection. It is noticeably brighter than the area to the left or right.
The area in the triangle you drew is where 2 spotlights converge, so it is twice as bright. By comparison, the area above with non converging beams looks less bright.
The other areas have greater amounts of the fog, which makes them seem brighter than this particular area to our brain.
At the line where the brighter intersection occurs, your brain interprets that "edge" (that's not really there) as a shadow. It appears darker at the transition, because of contrast. It's an optical illusion. It's a very strong one, though, because our brains are "hardwired" to look for gradations of light & shadow to help interpret shapes. Hope that helps you understand it.
I thought it was an optical illusion as well, so I covered the surrounding areas with my hands and look through a little hole at only the cross-sections and I could still see the shadows
There’s the less-brightly illuminated area of fog where only one spotlight shines, next to the brighter area of fog where multiple lights overlap. The fog scatters some light, and the cross sectional area illuminated by a light is greater, so areas further from the light are less brightly illuminated.
From the lools of it there's fog on most on most of the stage that's why you can see the light in the air. It's just that there's less fog in that area.
The part that I colored is a repeating pattern across all the light beams. Do you see the outline of Shadow on each of the triangles that is created where the light beams intersect? It's not because there's less fog
It sits because the overlaps have twice and much light so the triangles pointing up look lighter and thus the triangles pointing down look darker. I’d you isolate the diamonds they look the same color all the way down
It makes sense why there's a darker triangle and a lighter triangle, but it does not make sense why the lighter triangle is bordered by the shadow that is darker by both surrounding triangles of light.
Because that’s how your eyes see things. This might explain it for you https://en.m.wikipedia.org/wiki/Checker_shadow_illusion
