Question: So, as I've mentioned in previous questions, I am writing a series in which the four young main characters encounter natural, traversable wormholes that connect the present time to another one. I've vaguely figured how I want them to work and how this way connects (mostly) to the real theoretical science behind it (specifics will be explained below for those curious and if it connects to my question). My question now is this; If I want to continue being vaguely scientifically accurate, how would a speculative wormhole look to humans looking at it from outside? For someone stepping through it to the other side? How many artistic liberties can I really take while still being scientifically accurate? Thanks so much for taking the time to speculatively answer this question and have a good day!

(For those interested, the wormholes tend to stick near objects with larger gravity to keep our intrepid little explorers from stepping through one and ending up somewhere out in space and suffocating. They tend to occur most on the time equivalent of "fault lines" where time 'tears' more easily, like weak points on a blanket. Yes, I do know it's definitely more complicated than that, but I'm simplifying things a bit so it makes more sense. They also can connect places in both place and time, so they can end up from a little town in modern day Oklahoma to the volcanic jungles of Early Cretaceous China. Finally, they are also traversable by simply stepping through since the main characters are just a few teenagers who stumble across them and don't exactly have resources to get a vessel to take them through Interestellar style.)

Answer: 
Wormholes are purely hypothetical, but would probably appear similar to a black hole. Take a look at the artistic interpretation of a black hole, from the movie Interstellar [here](http://interstellarfilm.wikia.com/wiki/Gargantua), and that of a wormhole [here](https://en.wikipedia.org/wiki/Wormhole).
It seems to me that a photograph of a *non-lethal* wormhole will look exactly like two photographs, one on top of the other. The one on top will have a circular hole in it. The two should be the same scale, that is no magnification, nor should their be any distortion. 

Why? Because if the light is being distorted, then there would have to be tremendous gravitational tidal forces involved, which would do bad things to matter, specifically to living matter. You could surround each hole with some sort of "leakage" - maybe a glow, or sparks, or some mild sort of distortion (like mirages - you know - *wavering*). 

And of course while the hole would look circular, as you changed your position, the view would change as well. As you moved around the hole, the view through the hole would rotate as well. So, it would basically be a spherical TV screen. In fact, we could probably make one today that came pretty close (some TVs have horizontal curvature so you could make a ring out of a bunch of them. 

Two problems with that: 

1. The screen is concave, and you want convex
2. Screens available today don't have both horizontal and vertical curvature (as far as I know)

But anyway, a polygon with enough faces is very close to looking like a sphere, so just picture a ball with monitors stuck to it. Reduce it to the size you want your hole to be (4 ft radius?) and imagine the cameras showing the entire 4π steradians of from the (multiple) cameras viewpoint.