It's not hard to imagine these sails powering an alien ship across a strange ocean.
Perhaps they are? At least it's a far more interesting perspective than simply providing shelter from the sun and rain.
From any perspective, shade sails have a beautiful form that begs to be captured, especially this evening lit by the full moon.
Photo: Robert Rath, '366 Days of 2012, Day 304 - Full Sails Under a Full Moon'. 20s f/13 ISO1600 17mm