EWA: with a little patience you could use a Pothos or phillodendron, place the pot on a corner shelf about as high as is convenient for you, keep growing the vines out until long enough to reach up the wall to the window sill. Once or twice a year you still have to get up there to manage the plant, but all the business of ferts/watering etc can still be done as needed down at the pot.
Worst scenario is may drop leaves along the rise and leave a naked vine if corner is too dim, but I doubt it. In any case the vine can definitely have profuse and vigorous growth in window even if its a long way from the pot. the trick is you'll have to grow it out somewhere else, just keep wrapping the vines around a hanging pot till you get 15 feet, and then do you run it to the window. example: Pothos (Marble Queen or Silver Queen) stretched across 12 foot room from pot. Approx 3-4 years old.
I stretched it out, here she is normally-notice all the hanging are not ends until they have looped once at least. Three of the eight primary vines are 13-15 feet shortest is 11 ft. This plant is intended soon to be adapted along top of wall in basement to soften mood lighting concealed behind the crown molding. Good Luck!!!!
