I have sent, by PM, synthetic 3D renderings of cool images you've posted to a number of you.  This is mainly for fun, but as it turns out there is a useful side that I discovered.  First, though, a bit of explanation. The 3D renderings I've PM'd to you up to this point have been created in StarTools.  If you load a processed image into this software, you can elect not to activate tracking; the last item on the menu, then, can be used to prepare a synthetic 3D rendering.  "Synthetic" means that the 3D is not actually how we would see the image with our stereoscopic vision, in which the eye and brain interpret the objects in our view to show depth in relation to how distant each object is (and thus has a different sight angle than objects at other distances).  To mimic this effect, the software internally works with two copies of the original, which you can imagine as sitting side-by-side.  An algorithm then decides which features seem closer and which seem farther in the image (I really don't know what StarTools does, but it probably has to do with brightness, size or both).  Then by morphing, the closer objects are shifted sideways to a greater extent while the more distant objects are shifted sideways to a lesser extent, thus simulating the different sight angles from each of our eyes to objects.  This creates a pair of images called a stereoscopic pair.  If an observer looks at the two (it's easier with smaller versions) and relaxes his/her eyes as if staring into the distance, the objects will "float together" and the 3D effect kicks in.  It takes some practice, so don't give up too soon!

So, I sent one of these StarTools 3D renderings to @Christoph Lichtblau  and, as it turned out, he really liked it and he included it as a revision on his post of the original image (which was of the Heart Nebula).  Both Christoph and I have a few loose screws (I am decidedly worse, I will admit), so he thought he'd like another 3D rendering, this time using a beautiful image of the Bat Nebula that he had taken (https://www.astrobin.com/xvpwbn/C/?nc=&nce=).  But he also thought that we should send it out for everyone as a general post.  One does not argue with a happily motivated German, so I immediately accepted the challenge of making the 3D view of the Bat that is posted herewith!  Team Christoph/Lantz sincerely hope that you find it interesting and fun. 

However, this time around, it wasn't simply just fun for me.  I did not use StarTools, but struck out on my own and this is where I learned something that could be very useful in general for processing images.  In the Revisions area, the original image by Christoph is shown and Revision B shows the two copies that I placed side-by-side as the starting point.  I chose to shift features leftward in the right image, so I elected to shift brighter stars to the left more than dimmer stars and likewise for brighter parts vs dimmer parts of the nebulosity.  But how to shift things?  You can't just circle them with the oval tool in Photoshop and drag them to the left because empty (white) gaps are created.  But Photoshop has a tool called Puppet Warp.  Revision C shows how this tool imagines a network of patches connected like in a mesh.  By clicking on the image, you create a pin that you can use to drag parts of the image around without "tearing" gaps in the mesh; closer patches of the mesh are moved more than more distant patches, but the morphing effect leaves no gaps.  I can see how this tool could be very helpful when merging masks with underlying images or trying to align images for stacking that have weird problems like off-center field rotation or areas of irregular distortion.  So there it is, another tool for the imaging tool kit!