this post was submitted on 26 Aug 2024
74 points (91.1% liked)

Ask Lemmy

26884 readers
3966 users here now

A Fediverse community for open-ended, thought provoking questions

Please don't post about US Politics. If you need to do this, try !politicaldiscussion@lemmy.world


Rules: (interactive)


1) Be nice and; have funDoxxing, trolling, sealioning, racism, and toxicity are not welcomed in AskLemmy. Remember what your mother said: if you can't say something nice, don't say anything at all. In addition, the site-wide Lemmy.world terms of service also apply here. Please familiarize yourself with them


2) All posts must end with a '?'This is sort of like Jeopardy. Please phrase all post titles in the form of a proper question ending with ?


3) No spamPlease do not flood the community with nonsense. Actual suspected spammers will be banned on site. No astroturfing.


4) NSFW is okay, within reasonJust remember to tag posts with either a content warning or a [NSFW] tag. Overtly sexual posts are not allowed, please direct them to either !asklemmyafterdark@lemmy.world or !asklemmynsfw@lemmynsfw.com. NSFW comments should be restricted to posts tagged [NSFW].


5) This is not a support community.
It is not a place for 'how do I?', type questions. If you have any questions regarding the site itself or would like to report a community, please direct them to Lemmy.world Support or email info@lemmy.world. For other questions check our partnered communities list, or use the search function.


Reminder: The terms of service apply here too.

Partnered Communities:

Tech Support

No Stupid Questions

You Should Know

Reddit

Jokes

Ask Ouija


Logo design credit goes to: tubbadu


founded 1 year ago
MODERATORS
 

edit: Thank you to all who answered! I’m amazed at how many ways you came up with to answer this.

you are viewing a single comment's thread
view the rest of the comments
[–] TheBananaKing@lemmy.world 31 points 2 months ago* (last edited 2 months ago) (1 children)

Mirrors can totally reverse top-to-bottom, you just have to bend over to see it. The left-right bias is based on the way we look behind us, not any property of the mirror.

This takes a little explaining.

A rotation is a reversal through two dimensions at once.

If you turn around to look behind you, you're swapping front-and-back, AND left-and-right.

If you stand on your head, you're swapping front-and-back AND top-and-bottom.

Stand facing the way the mirror does, then turn to look into it. You have to do some kind of rotation - a two-dimension reversal - to get there. If you're a normal human, you'll twist around, swapping left-and-right as you swap back-and-front. Your left and right ear swap places, your nose and the back of your head swap places too.

But your reflection doesn't do that.

A mirror only reverses ONE dimension: front-and-back. It's the equivalent of punching your face out the back of your head: its ears are still on their original sides. You have swapped left and right in order to face in the opposite direction, but your reflection hasn't - so it's ears are on opposite sides to yours.

But you can do it the other way.

Stand with your back to the mirror, and bend over and look under your arm (or between your legs) to see your reflection, instead of twisting around.

Hold something with writing on it, and you'll see: the letters in the reflection are upside-down, but they face in the right direction.

The only reason you don't see this very often is that it's a fucking weird thing to do and nobody ever does it.

[–] criitz@reddthat.com 8 points 2 months ago

Just look at the reflection of the sky in a lake (try any Bob Ross painting) to see a mirror reflect top and bottom