I don’t know how to comment when I see this. I want to talk about how this works, but most people know how this works. So I don’t know why its a thing. Its funny though.
This particular version is more about the characters depicted (Denji and Power from Chainsaw Man), who are famous for being endearingly stupid.
The more earnest versions you tend to see on TikTok are mostly posted by, or at least targeted at, actual kids who don't yet understand how vision works. Nobody on Lemmy is under the age of 30.
I would like to hear an actual explanation. I don’t know shit about light physics but my attempt to explain it is that the trajectory of the light is such that it reflects off of the egg into your eyes and that it is this trajectory that is reflected in the mirror.
My wife was having a brain fart once and knew there was a logical reason but couldn't figure it out atm. So I drew a diagram top down geometry class style. Set her straight just like that. It's just the light bouncing at an angle so that you can see what is on the front of the paper.
I thought this whole "object behind paper against a mirror" thing was just a meme at first because the result is very intuitive and not at all shocking... But then I guess people genuinely didn't get it? People really can be so stupid.
They're from an anime, Chainsaw Man. Haven't watched idk why they have sharp teeth, but my best guess is that it's an anime where they use their OP chainsaw teeth to make a killing in the lumber industry, that's definitely what it's about.
They have sharp teeth to show they are demons, I thought. The main dude doesn't have sharp.teeth until he is made into a demon when his little chainsaw dog replaced his heart.
Others have pointed out there is inconsistencies with this, though. I just figured they were oversights in production and the sharp teeth are still intended to represent when the character is demonic.
The angle of incidence is equal to the angle of reflection.
This essentially means "if you can see it, it can see you". The mirror doesn't "know" anything. The light from the object is bouncing off of your eyes and hitting the mirror, which reflects it back at you.