For lazy summer days with a slight breeze, rock yourself back and forth by controlling this sail attached to your hammock. Actually this is best done inside with a hand-held foam oar-sail.-- JesusHChrist, Jul 08 2013 Sorry, guess there I'd already one out there http://www.flateart...m/Sail-Hammock.htmlDon't like that design though [JesusHChrist, Jul 08 2013] No, the one in the picture just blows in the wind, your proposal is for a regular hammock with a CONTROLLABLE sail. [+] (Although I don't believe in you)-- pashute, Jul 08 2013 You don't have to believe in me as long as you believe in the sail you can't fail.-- JesusHChrist, Jul 08 2013 random, halfbakery