A vortex in water casts/maintains a perfectly circular shadow no matter where it moves, two-dimensional representation of itself that looks suspiciously like a black hole.
Light/photons do not pass through the mouth of the vortex. The path of light is diverted by the angular/radial momentum of water molecules, down into the narrowing body of the vortex. This provides an example of what is known in physics as Anti-De Sitter Space. A form of dimensional inversion where a black hole or shadow in this case has all the occurrences of light within expressed tightly around the circumference of the black hole ..I mean shadow.
Three-dimensional occurences can be expressed in two dimensions (light at circumference).
This would suggest the occurrence of a blackhole might not be the physical location of the vortex. As if navigating through the physical blackhole is not the issue but the nearby vortex which causes it's projection might be. A thought experiment...
This theorem is analogous to that of the stop sign. If these conditions proved to be exact that would make blackholes the two-dimensional interstellar traffic sign. Also analogous to the buoy which prevents ships from driving their hulls into underwater rock and geological formations.
Given a light source ahead of us in our starship, the vortex between us would cast it's two dimensional projection closest to us and the endpoint of the vortex. The mouth of the vortex is closest the light-source if we are approaching the projection (blackhole).
It does not matter where the endpoint of the vortex leads or if it moves, the mouth of the vortex determines the location and stability of the two-dimensional projection.
Yes, physicists might be trying to "enter the egress".
For decades theoretical physicists have been sacrificing poor Alice and Bob into, around and through blackholes on blackboards or PowerPoint slides. Sensors, satellites and ships have also been "sent" into these blackholes.
What if?? ..Alice and Bob were safe all along.
The two-dimensional projection of a three-dimensional vortex in space through which are diverted all types of particles and frequencies.
2D BH = 3D VTX?
Aha, that also explains clearly the apparent loss of information considered by theorists. When translating three-dimensional co-ordinates down to two dimensions, a certain amount of information is "lost" or unintelligible after the transformation. Either way, I think we can stop trying to put things into a shadow for fear of it.
What we can plan for in the case that the above postulations happen to be confirmed... a radio transceiver can be sent into the mouth of the vortex, probing the exit point (egress), if it exists within our universe and range of radio communication.
Comparing the physics of vortices with systems of orbits ..the gravitational differences may provide "footing" for confirming an aspect of gravity that differs between them.
After considering NASA's interpretation ..the two-dimensional projection (optical effect) still stands as logical and plausible. 