Ah! Now that makes sense!
In that context, it looks a bit like a solar yacht/clipper with the sails stowed.
A few images to give an idea of what I'm talking about:
![](https://borgdotcom.files.wordpress.com/2012/03/moebius-solar-sail-seen-in-tron.jpg?w=497&h=321&zoom=2)
![](http://1.bp.blogspot.com/_fa6AZDCsHnY/S_C9Ll986gI/AAAAAAAAACY/eTykcbU6PTE/s200/solarsail.jpg)
![](https://davidleesummers.files.wordpress.com/2014/02/aristarchus-sail-array.jpg?w=1280&h=1600)
![](http://www.giantfreakinrobot.com/wp-content/uploads/2011/10/solar-sails.jpg)
I've seen dozens more designs of varying degrees of actual practicality, ranging from the sublime to the ridiculous.