Brigitte Helm in Metropolis (1927, dir. Fritz  Lang)
On the creation of Robot Maria:
“The  concentric rings of light that surround her and move from top to bottom  were in fact a little ball of silver rapidly swung in a circle and  filmed on a background of black velvet. We superimposed those shots, in  the lab, over the shot of the robot in a sitting position that we had  filmed previously.”
-Fritz Lang

Brigitte Helm in Metropolis (1927, dir. Fritz Lang)

On the creation of Robot Maria:

“The concentric rings of light that surround her and move from top to bottom were in fact a little ball of silver rapidly swung in a circle and filmed on a background of black velvet. We superimposed those shots, in the lab, over the shot of the robot in a sitting position that we had filmed previously.”

-Fritz Lang