Water screen as fire shutter
This is a water screen which is used as a fire shutter. Usually, it's not easy to come and go through fire shutter and impossible to see what is happening at the other side of the shutter. But this water shutter shuts out such problems.
(KAJIMA/ via Tokyo Shinbun)
What we want for fire shutter is "people go through but no fire". This is a just as well.
