How did Janus come to be emblematic of film?

[Daniel Cape]

>> Janus Films uses an ancient Romanesque coin with a Janus figure
>> emblazoned on it as their brand icon...
> Well, I'm guessing, looking backward @ classics, looking forward @
> classics-to-be, @ least in this case, so ...

Yes, good point. I guess it's demonstrating the all-encompassing
prestige of the film company (Janus films has got the God's eye view
of (film) history!). Are there any other instances of this icon in
(film-ish) use?
I'm particularly interested in what Heikki raises below:

> Films are dreams we have together (Cocteau), we are Januses,
> thresholders of dreams, but at the same time, the Janus-film
> returns our gaze, as daddy Lacan always sez - like that black
> window on the opposite side of the yard watches Jimmy Stewart
> in "Rear Window", the film regards us.

Yes, this is interesting. The psychology of film, the film as
collective dream; what McLuhan calls the narcotic or somnambulistic
effect of media incl. movies; film described in terms of this
paraphrase of CoL49's Jesus Arrabal's description of a miracle,
something like: "an intrusion of another world into this reality".