Dezaki, illuminated

A useful tweet with some 2004 documentary screenshots explaining an analogue lighting technique:

Comment faisait Dezaki pour insérer ces fameux faisceaux de lumière qu'on retrouve dans toutes ces oeuvres ? ⤵️ pic.twitter.com/fdUzRR9WzI

— Julien Bouvard (@julienbouvard) December 15, 2020

[Something like: How did Dezaki manage to add these famous light beams which one finds in all his works? I don’t really have French, so don’t take that as an authoritative translation!]