""" """
"" ^v^ ""
"" ^v^ ""
"" ^v^ "" ... low pressure
"""...""" held by vortex
######### ### dandelion falling
""""""""" """ rising air
I wonder about the chances of creating this kind of toroidal vortex above a duct for lift. It seems necessary for the air to pass in the same direction as the lift, yet lift is normally created by throwing air in the opposite direction.