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2,256,337 Views • Aug 19, 2022 • Click to toggle off description
Sometimes called transparent metal mirrors, these curiosities from China baffles western scientists for 100 years. The way they works is really surprising.
You can buy Chinese Magic Mirrors from Grand Illusions: www.grand-illusions.com/chinese-magic-mirror-c2x26…
You can buy my books here:
stevemould.com/books
Correction: 2:29 Ugh, those angles are off. The sides of the divot should be at 22.5 degrees not 45 degrees for those rays to be correct. But you get what I'm trying to show right?!
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Views : 2,256,337
Genre: Science & Technology
Date of upload: Aug 19, 2022 ^^
Rating : 4.963 (487/52,746 LTDR)
RYD date created : 2024-05-20T21:18:30.205527Z
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YouTube Comments - 1,419 Comments
Top Comments of this video!! :3
It's easy to intuit that imperceptible variations in the surface would cause a pattern in the reflection, but the convex shape making it distance-independent, that's the real genius. Amazing what they could invent thousands of years ago.
2.2K |
In your first example of an indent in the mirror (2:30) you actually created a retroreflector and the outgoing light would stay parallel to all the other rays.
467 |
Actually there is one more thing missing in this explanation: The part about the optical illusion.
How come, that there are large dark areas with light edges of the same brightness as the thinner dark lines? (or: how are there really large dark areas at all)
All the reflected light from this large dark area would have to be focussed in the light edge around it, making it much brighter than light edges of thin dark areas.
Answer: There are no "large" dark areas. Our brain interprets them as such. The inner "dark" part of the "sign of the zodiac" is actually as bright as the "light" part of the inner circle.
Simply pause the video (in the right frame), make a screen shot, paste it in "Paint", cut out a part of the dark and light area each and paste them on a white surface.
You will find that they have almost equal brightness. The "edge effect" really creates just pairs of bright and dark lines. Our brain additionally adjusts the brightness of the areas in between.
270 |
I was yelling "etching!" at the screen right from the beginning. It's THE go-to technology even today for creating shallow features after all, easy to control by time of exposure, and there's nothing high tech about it that couldn't have been done just as well in more primitive times.
272 |
Great to see Grand Illusions here! I'm only just now realizing there's probably a few videos you could make using Tim's magic toys. :D
667 |
Wow, it's incredible how those people 1000 years ago could predict that Einstein would be born and put his face on a transparent mirror
57 |
Aside from acid etching, you can also just stamp the surface then polish it back; if you light it while polishing in stages you can do it by hand without killing the image (I've seen this done with backed foil). Etching would probably be more consistent for mass production though.
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The ones you can by now are not made in the same way as they were traditionally. The "original" way was decently simple as bronze, while being a metal, is soft enough that surface-differences on one side can easily pass through to the other side when stress is applied - aka when polishing. That can intentionally be enhanced further but just casting it with a relief and then polishing will already give you this result.
But to produce them now there are easier methods than painstakingly and slowly polishing them. As many have said - etching is a very simple and fast method. You could also imprint them with a stencil.
103 |
Took me a while til I realized the light wasn’t passing through the disc. You’re pointing the light from the wall to the shiny side. Then the light bounces back towards the wall
79 |
I remember long ago watching a documentary that included how traditional magic mirrors were made in Japan after the technology was imported from China. The workshop would cast the mirror, with the image on the back. To bring out the image on the mirror side, months would be spent scraping the mirror surface. The maker would feel the surface, scraping off finer amounts, eventually polishing and apply a nickel finish. The presenter did mention that false backs could be added to conceal the original image, they didn't say how.
My source for this is the 2005 series "What the Ancients Knew" s01e05 "The Japanese".
18 |
Grand Illusions! That's a shout out on this channel I never expected to see. Those toys and trinkets that Tim shares from his collection are often a wonder to see.
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Steve, we talked about this. If it doesn't guggle, whistle or have a 2D representation of it, I don't know what's going on!
(lol)
14 |
The traditional method of making these was polishing a piece of metal by hand on top of a stone with the image you wanted to project. Each one would take days or weeks to make. But I doubt that’s how they make these modern versions you used in the video.
38 |
What happened to the audio at 0:47?
5 |
I think that the way that they make it is with masked polishing.
you polish the whole mirror surface with the base curve preset, then you mask the image and polish just a litle bit more, the reflected image is then the controlled defects in the polished surface
13 |
4:43 it might be more intuitive to portray the light rays as bright lines on a dark background :)
So bunched up lines would actually be lighter.
Regardless, wonderful video as always, thank you!
136 |
Neat that Grand Illusions supplied you with some mirrors.
That aside, it's crazy to think how this was found out thousands of years ago.
23 |
At first, I thought they probably transferred the image on the back by making the mirror, and then placing it on some stiff rubber and giving it a really hard whack, slightly bulging out the areas that were raised on the back. After you pointed out that the images' don't always line up, though, I bet the etching trick is probably correct.
88 |
One method I've seen at least, involves engraving the image in reverse on the back of the mirror, placing the back of the mirror on a hard, flat surface, and then polishing the front of the mirror to its final mirror finish. The pressure of polishing the front causes the metal above the relieved areas to distort slightly. Upon then bringing the back to mirror polish as well, the image becomes imperceptible to the human eye by direct observation from either side, the image only revealed in light reflected onto a surface.
93 |
@Mrdirt22
1 year ago
I imagine in manufacturing, the reflected image is simply masked on the mirror surface then etched with a mild acid which would slightly change the relief on the mirrored side. Once etching is completed it's simply cleaned and polished. This would account for the misalignment and non-matching images. This is also similar to the process which constructs the silicon wafers you mentioned for transistors.
1.7K |