Thank you for that info, BB.  I wasn't aware of that technique;  I'll experiment a bit.  While it may not be feasible to get precisely what Mr Sparky wants, we can probably get a result that will be satisfactory.

     I saw three main paths to try:

•   alpha plane billboard, which would need to be kept nearly orthogonal to the camera (using point at?)
•   3D mesh with material room mojo to produce the hologram effect
•   projected light -using a movie as a light gel- onto a receptor mesh

     Since the alpha plane billboard is obvious and trivial, I assumed that Mr Sparky had the second method in mind.

     Meanwhile, I'm trying to figure out why a test animation showed a monitor apparently displaying cell 1 of a 4x4 matrix for four frames, then frame 5 for four frames, etc.  My immediate thought was a logic error such that the image map wasn't stepping from cell to cell each frame, but when I substituted a diagnostic matrix image -with the cells numbered and an alignment grid- and rendered out a "draft" test, the progression was correct.  Advancing frame by frame also shows the logic to be correct and working properly.  This is what's delaying the completion of wall 3, Mr Sparky.  But I'm working on it.

     If anyone wants to test this, give your scene 32 frames, set the frame rate to 4-6 frames per second, tick the "loop" dot, and un-tick the "skip frames" dot.

     This has 16 cells, so with 32 frames you can see if the matrix seamlessly loops both within the string of frames (at the 16-17 frame jump) and at the termini (the jump from frame 32 to frame 1).

.  .

Poser 12, in feet.  

OSes:  Win7Prox64, Win7Ultx64

Silo Pro 2.5.6 64bit, Vue Infinite 2014.7, Genetica 4.0 Studio, UV Mapper Pro, UV Layout Pro, PhotoImpact X3, GIF Animator 5