what kind of book?
I could see writing a diary/autobiographical, or field guide of sorts, for different reasons, but don't think I would write a fiction book.

I guess a fiction book. A "work of art", in any case.

I wouldn't want to write a book even if there were billions of people to read it. So, I guess, no.

Do I need to see the movie to understand¿

There's no one here to see the art on the wall here, yet, it's there.

One may write a blog though, you know, for the future....
:)

While I can imagine Omega Elsa sketching or painting for pleasure, I don't think I'd be keen to take photos. Indeed, I'd rather write fiction for pleasure.

Might as well see Omega Man. It's a classic.

A chance to write without pressure of deadline, other than my own death, without criticism, without worry of sales popularity, without the requirement to please editors and fact checkers, and yet, be the very final word on any topic I chose?

Hells yes!

I'd write a journal, but not a fiction book.

As writing's not my outlet, maybe not. The only reason I'd do it was to keep a record of things that I'd done (planting food, important places in cities that I'd travelled to and may see again, that stuff).

I'd do art though. It's basically the same thing, say, if you're doing big pieces (sculptures, grafitti, etc.). It's still the record of "I was here. I did this, because I'm human, and we create things like this." I've seen pieces of art that would be seen by maybe 3 people created in the middle of nowhere, just because that person could, or had to... perhaps just because the inspiration takes you at that moment.

It's an odd little thing we have going, but it's what makes us different than (most? all?) of the rest of the life on this planet: the urge to leave a mark that we were here. It probably comes from our knowledge that we'll die one day in the future, whereas the rest of life on earth seems to be mercifully oblivious to it.

I don't really understand the difference between making visual art and writing in this context. (I'd probably do both, but not having anyone to talk about the art and writing with would still drive me hootingly insane.)

I'd write a journal/non-fiction type thing. I'd write as if someone will find it sometime in the future. I'd chronicle how I'd become the last person on earth, what life used to be like, and how it had changed. Writing like that would almost be like talking to someone, in a way.

I'd write before I'd take pictures or do art. I don't enjoy taking pictures, and I can't draw or paint worth a damn.

Sounds like it's a mix. For me writing is an extrovert action, when I write I am trying to communicate to others (other than taking notes, of self documentation). When I take photos or engage in other forms of art it is more introverted, there is a large part of me that doesn't care if others see it. I still show the stuff around and get a buzz when people like it, but I would be content if this aspect didn't happen.

I guess I wondered if writing is a more communicative form of art, but many of your answers indicate that it is a challenge and a game one plays with oneself, and a pure creative impulse, even if no-one but the author ever reads it.

Very interesting.

I'd say most arises from a pure creative impulse. Some of us happen to be drawn to one form of art more than others, so that form seems somehow exceptional to us; but all forms arise from the same impulse and scratch the same itch. Their subtle differences are endlessly fascinating, but where artists are concerned, few art forms are at all dependent on a real or imagined audience.

I wouldn't write a fiction book; I don't enjoy fiction writing. But I can imagine still keeping a logbook, sketchbook, and/or journal. And certainly I'd write and sing songs. ANd maybe make recordings of the songs. But I don't know that I'd take any photographs.