https://www.wired.com/video/watch/design-fx-inside-orphan-black-s-amazing-visual-effects
If you haven't seen it, "Orphan Black" is a BBC show about a group of clones being hunted down by their creators.
One actress played about 20 different roles in the series; and there were a few scenes where all the clones were in the same room together.
Great show and a masterclass in acting.
When you see those Veterans' Day parades and a tiny number of WW2 and Korea vets marching...