A skysail is a sail on the highest part of a ship.
A skysail can make people think of adventure, the sea, and old stories.
Examples:
The ship has a skysail at the very top.
The sailors climb up to fix the skysail.
The skysail is the biggest sail on the ship.
The cat climbed up to the skysail and got stuck!
The skysail is so big, it can catch all the wind.
The pirates raised the skysail and set off to find treasure.