Has anyone here worked out ways of doing multiple mirror effects on video. For example to achieve the look of a kaleidescope? Right now I am playing with it using a combination of rotate -> set alpha (using a mask) and -> mix nodes. Has anyone come up with another process that is better?

Nifty question! I’d personally be tempted to use an animated material UVmapped to individual faces with different orientations. SHould be a lot easier.