I’ve never seen one of these…

I never have either. More on it:

https://www.macsmotorcitygarage.com/one-off-factory-fastback-the-1964-comet-super-cyclone/

Maybe it's my immediate involuntary mental comparison to the very attractive Barracuda, but this Comet is not a design that appeals.  I love the actual '64 Cyclone however.

I seem to remember this being covered on the platform last year with its exhaust exit coming in for some harsh criticism. Otherwise, I love it!

@charles-rockett If the whole car was reversed,(the front would become the rear, and the rear become the front) it would probably appeal to me, then again, probably not. Are you as confused as me?

It's not an unattractive piece of roof/rear window styling in its own right, especially in that rear three-quarter view, but it doesn't sit too well with the squared-off lines of the car as a whole.  In side profile I see a bold front end that kind of sags and goes a bit limp-wristed towards the back. With a lower, softer nose profile it would work OK. But then it wouldn't be a Cyclone any more!