[alatar]

Again, from reading the text, I remembered that the Black Gate was not originally constructed by the Dark Lord, but by the Númenóreans. Not sure why PJ and WETA, who at times followed the Tolkien's descriptions of items did not here. Surely there wasn't an illustration, and the text does give one room to imagine, but I'm still not sure why we have the 'door-like' gate as opposed to the regular gate that opened like a portcullis - that fence-like thing that goes up and down. Was the weight of the gate too much for such construction, as it was to be of iron? Did PJ et al want to keep the battlement looking like one solid wall across the valley so that we could see across the top into Mordor (as opposed to having a tower or towers atop the Gate, breaking up the view)?

If single- or double-door like, like we see in Minas Tirith, then they should open inward (if Sauron switched them) or outward, if the Gondorians built them - easier to shut them up.

Didn't see much from Alan Lee or John Howe that shows that the Gate is exclusively one of their works.