Yotsuya Ghost Story: In an earlier scene, Iemon has had Oiwa and Kohei nailed to either side of a rainboard and dumped in the Onbo canal. Here Iemon inadvertantly fishes the rainboard out of the canal. The same actor plays both Oiwa and Kohei by means of a quick-change stage trick called "the raindoor switch" (toitagaeshi). See the image of Kohei below, from a different production.
Here we see Kohei's side of the raindoor. How do you think the "raindoor switch" is done?
Woodblock print version of the same scene
