Set up a ladder directly below the center of the sloped ceiling.
Press the tip of a screw-in wall hook into the center of the sloped ceiling and twist it clockwise until the hook is firmly anchored. Install the wall hook so that it is pointing straight down.
Hang a hoop canopy on the wall hook to transform the entire sloped ceiling area into a billowing canopy. If the hoop structure is too large to hang freely without bumping into the slanted ceiling, tie a 24-inch length of ribbon into a loop and hang it from the hook, then hang the hoop canopy from the ribbon.