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[-] half_built_pyramids@lemmy.world 236 points 10 months ago

Uhh, because of the heat of the raspberry pi & camera behind there

[-] stinky@redlemmy.com 66 points 10 months ago

well. at least my viewers will know it had a flared base.

[-] LodeMike@lemmy.today 28 points 10 months ago

Ah yes, 10W of heat :3

[-] otacon239@lemmy.world 9 points 10 months ago

Suppose you were in this situation and suspected something. I’d imagine the space behind it would be totally dark, so what would be a safe way to check if there’s a gap in between without breaking the glass?

[-] vrighter@discuss.tchncs.de 26 points 10 months ago

there are no "one-way" mirrors. You just need to make your side darker than the other side (there's a reason the observation side of a two-way mirror is never brightly lit, but the interrogation room is)

Tldr: put your face right up against it and use your hands to block out as much light as you can

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[-] GuyFawkes@midwest.social 8 points 10 months ago* (last edited 10 months ago)

I read a long time ago that putting something flat against the mirror will show you. I think if the mirror is legit you’ll see the reflection directly on the surface, if it’s two way the reflection will look like it’s inside the glass.

But I’ve never had the chance to actually test that, so take it with a grain of salt.

Edit: Turns out this is incorrect; thanks to everyone for educating me!

[-] wesker@lemmy.sdf.org 24 points 10 months ago

You want there to appear a "space" between your fingertip and the mirror, if touching it directly. If there's no space, then say cheese.

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[-] qupada@fedia.io 15 points 10 months ago

It would be the other way around, if at all.

"First-surface" mirrors where the reflective layer is on the front of the glass are quite fragile, so wouldn't typically used for residential applications (you'd remove the reflective coating by cleaning it).

A regular mirror has the reflective surface on the back of the glass (which is then is further coated with a protective paint), leading to the effect you describe.

I don't however know enough to say one way or the other whether a surveillance mirror would becessarily be a first-surface mirror.

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[-] TeamAssimilation@infosec.pub 15 points 10 months ago* (last edited 10 months ago)

This is ancient advice for two-way mirrors, IIRC nowadays even legit mirrors can reflect directly from the front instead of the back. In this age of spy cameras this is mostly irrelevant.

Another tip was shining a bright light to illuminate the supposedly dark room on the other side, which again, would be way more expensive than a smoke detector spy camera.

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[-] philpo@feddit.org 101 points 10 months ago

Guessing this is a hotel bathroom by the looks of it.

Then it very likely has a mirror with integrated heating. I have one myself and love it.

[-] NigelFrobisher@aussie.zone 53 points 10 months ago

It’s heated.

[-] FaceDeer@fedia.io 48 points 10 months ago

There's a ghost in your house that's trying to tell you "rectangle", but it's illiterate.

Try to figure out what "rectangle" means.

[-] AliasVortex@lemmy.world 29 points 10 months ago

Nah, just means that the mirror can't render the Unicode character that the ghost has sent.

[-] funkajunk@lemmy.world 11 points 10 months ago
[-] AmazingAwesomator@lemmy.world 10 points 10 months ago

or the eggplant emoji. its placed after a shower.

[-] coldasblues@sh.itjust.works 40 points 10 months ago* (last edited 10 months ago)

Don't believe any of the other comments, this is clearly a one-way mirror with a camera inside. That conspiracy theory you've been thinking about a lot lately is true, and even worse they know you are on to them. Remember that creak in the floorboards you dismissed as the house settling? Footsteps. The way your coffee mug was turned slightly counterclockwise this morning? Intentional. They watch you when you sleep, and know how much time you spend looking at your phone.

Or it's what the top comment said. Sleep tight!

[-] Asetru@feddit.org 8 points 10 months ago

Or it's what the top comment said. Sleep tight!

Writing this in the top comment doesn't help, like, at all...

[-] NuXCOM_90Percent@lemmy.zip 37 points 10 months ago

There are coatings /sprays for this

[-] bulwark@lemmy.world 64 points 10 months ago

I think in this particular case it might be an integrated heating element like this: https://clearmirror.com/products/shower-clearmirror

They're popular in shower rooms in Japan.

[-] saltesc@lemmy.world 50 points 10 months ago

You're popular in shower rooms in Japan.

[-] bulwark@lemmy.world 28 points 10 months ago

A gee, thanks.

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[-] taiyang@lemmy.world 35 points 10 months ago

This comments section feels like schizophrenia.

[-] kSPvhmTOlwvMd7Y7E@lemmy.world 12 points 10 months ago

These are such a good idea. It works by having a heater behind the mirror which prevents the condensation.

[-] stinky@redlemmy.com 10 points 10 months ago

These are such a good idea. It works by having a heater behind the mirror which prevents the condensation.

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[-] maniacalmanicmania@aussie.zone 33 points 10 months ago* (last edited 10 months ago)

For anyone who wants to achieve the same effect take a dry bar of soap and rub some into an area of a mirror in whatever shape you like (circle, square etc). Then buff it out with a dry soft towel or cloth until you can no longer see the soap. Next time you take a shower that part of the mirror won't be fogged up. Reapply soap and buff out every couple weeks or so if you want it to stay that way.

[-] mnemonicmonkeys@sh.itjust.works 27 points 10 months ago

I'm going to draw penises the next time at a friend's house

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[-] kattfisk@lemmy.dbzer0.com 31 points 10 months ago

I had this happen in a hotel, and being curious I removed the mirror, and yes there was a hole in the wall behind it, no there wasn't a camera there. It was just were they had ran the wiring for the lights on the mirror.

It would make sense that it serves like an access hatch to a terminal block that feeds the whole room. It's simple, costs nothing, is easy to get to (compared to having it sealed in the wall), protected from splashing and prying guests, and close to where you want most lights and outlets.

[-] mathemachristian@lemmy.blahaj.zone 40 points 10 months ago

being curious I removed the mirror
protected from [...] prying guests,

blobcat, googly, think

[-] kattfisk@lemmy.dbzer0.com 27 points 10 months ago

Nothing is protected from those willing to pry hard enough ;)

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[-] Feathercrown@lemmy.world 21 points 10 months ago

These are such a good idea. It works by having a mirror behind the heater which prevents the reflection.

[-] nailbar@sopuli.xyz 18 points 10 months ago

Alright, but now the heater is in the way.

[-] Feathercrown@lemmy.world 17 points 10 months ago

Yeah, that's why it prevents the reflection

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[-] elgordino@fedia.io 16 points 10 months ago

These are such a good idea. It works by having a heater behind the mirror which prevents the condensation.

Ps. Excuse the multiple posts. fedia.io was having a moment. I’ve deleted them now

[-] SaveTheTuaHawk@lemmy.ca 11 points 10 months ago

Apparently no one here has been to a Home Depot or Lowe's in the last 15 years.

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[-] 0ops@piefed.zip 14 points 10 months ago

Maybe somebody's stashing delicious freshly baked goods back there?

[-] Kolanaki@pawb.social 13 points 10 months ago

It's a two-way mirror and there's a camera on the other side recording you 24/7.

[-] blave@lemmy.world 8 points 10 months ago

Isn’t a two-way mirror just a window? I think you meant “one way mirror.”

[-] Kolanaki@pawb.social 32 points 10 months ago

No. English is just hella stupid. 🤣

A one-way mirror, also called two-way mirror...

https://en.m.wikipedia.org/wiki/One-way_mirror

[-] logicbomb@lemmy.world 11 points 10 months ago

How many ways is a normal mirror, then? Do we call it a "no way mirror"?

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[-] Adulated_Aspersion@lemmy.world 11 points 10 months ago

Just posting to say I was here when everyone replied with "These are such a good idea. It works by having a heater behind the mirror which prevents the condensation."

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this post was submitted on 24 Sep 2025
356 points (98.1% liked)

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