In my grammar school years back in the 1920s I used my ten-cents-a-week allowance for Saturday matinees of Douglas Fairbanks movies. All that swashbuckling and leaping about in the midst of the sails of ships!
Some people may say my curved panels look like sails. Well, I am a sailor, so I guess I probably do use that metaphor in my work - though not consciously.
I wanted to make sure that 'Up' wasn't a 3D movie about a man who sails his house to South America. It's a movie about an old man who sails his house to South America that also happens to be in 3D. So the first thing is always the story.