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minutephysics
Passing A Portal Through Itself
Passing A Portal Through Itself
minutephysics
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4:05 · Sep 1, 2022
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portals
those
magnificent
sci-fi
devices
where
you
step
into
one
end
and
are
immediately
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portals those magnificent sci-fi devices where you step into one end and are immediately
0:11
transported somewhere else portals are just begging for us to ask
0:15
what happens if you pass a portal through itself
0:18
because anything going into the orange portal comes out of the blue portal
0:21
so when the Blue Portal goes into the orange portal
0:24
it should come out of itself
0:26
which is that even possible
0:28
yes I'm going to show you how
0:30
and it's weird to make things easier we'll start with a portal in 2D
0:34
space which is basically a line
0:36
we'll imagine these work just like portals in 3D
0:38
when an object enters a portal it exits at the same position relative to
0:42
the other portal the idea is that if you put two portals back to
0:44
back you can't tell there's a portal at all and then you keep that
0:47
same relative Behavior no matter where you move or how you Orient the portals
0:51
so an object entering near the bottom of the orange portal exits near the
0:55
bottom of the Blue Portal
0:56
and so on and if the Blue Portal itself starts to pass through the
0:59
bottom of the orange portal portal and we'll try to keep it clear where
1:01
the front and back and top and bottom of the portals are so you
1:03
can tell how they're oriented
1:05
if the top of the Blue Portal enters the bottom of the orange portal
1:08
it will emerge out of the bottom of the Blue Portal with the same
1:10
relative orientation which looks weird
1:13
but it's what logically should happen
1:15
if we just keep pushing the Blue Portal in the portal will crash into
1:18
itself and we won't be able to keep going
1:19
and it's the same if we flip it and put the bottom of the
1:21
Blue Portal in near the top of the orange
1:23
but if we put the top end of the Blue Portal into the top
1:26
of the orange portal
1:27
it comes out of itself closer to the top until the part coming out
1:30
of itself goes back into the orange portal again and comes out of the
1:33
blue portal farther down it's the portal coming out of itself coming out of
1:36
itself it's all a bit confusing to keep track of but it's may be
1:39
slightly easier if we add numbers along the Blue Portal so you can keep
1:42
track of which part of it is where
1:44
because you should be able to keep track of the entire Blue Portal
1:47
there's no inside of a portal since anything that passes through one portal is
1:50
immediately outside the other end
1:52
so 100% of the Blue Portal must remain visible and in existence
1:56
at all times that is we should always be able to account for the
1:59
full length of the Blue Portal no matter how weirdly recursive
2:02
the situation becomes and it can be very
2:04
very weird and pretty
2:06
but definitely weird anyway to get the blue portal to go all the way
2:10
through the very end of the Blue Portal has to finish coming out of
2:13
itself as it simultaneously
2:14
disappears into the orange portal
2:16
which seems impossible unless the portal is infinitely
2:19
thin otherwise it's going to get stuck on itself or get squeezed or something
2:22
but if we allow ourselves a little flexibility
2:25
a 2d portal passing through itself
2:27
looks like this or
2:29
this or this and in 3D
2:33
it's similar but slightly more confusing because of the multiple rotations needed to fit
2:36
the portal through itself
2:38
here's one way a portal can pass through itself where I've colored the back
2:41
side of the portal black and kept the front side a solid color and
2:44
here's the same thing with a grid on the portal so you can keep
2:46
track and really confirm that it is always 100% outside
2:49
even as it's passing through itself
2:51
but of course you probably want to be able to look through the portals
2:53
as this is all going on which looks something
2:55
like this to be honest I was kind of surprised that it's as possible
3:02
as it is to pass a portal through itself
3:04
but when we follow things through to their logical conclusions
3:07
sometimes the universe even a madeup one
3:10
can surprise us and while it may not surprise you to learn that I
3:14
made the animations in this video using visual effect software I also had to
3:17
use a fair bit of computer coding as well computer coding sneaks in everywhere
3:21
these days even video editing and that's why you should check out nebula classes
3:24
this video sponsor nebula is the creator owned streaming platform I'm a part of
3:28
and yes there are now classes by your favorite creators
3:31
including one on computer coding by YouTuber and NYU
3:33
Professor Daniel schiffman Daniel's whole approach is to give you the basics independent of
3:37
programming language so you understand how coding works in general and then when it
3:40
jumps out at you in life like maybe in your video editing software you
3:43
won't be intimidated other classes include those by Adam Neely Wendover
3:47
Productions Devon Stone Amy no
3:49
and more nebula classes is $119
3:51
a year if you sign up via nebula classes.com
3:53
minute physics and that includes all the rest of nebula too
3:57
nebula classes great classes from your favorite
3:59
creators and no I don't have one on there yet
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