Blinds can be hung from the ceiling, using special ceiling brackets, so they are suspended at an appropriate clearance distance from a window or door.
The ability to mount a projector to the ceiling. Most projectors, when ceiling mounted, must be hung upside- down. To eliminate image distortion known as "keystoning", ceiling mountable projectors have the ability to electronically invert the image.
An alternative mount for vertical blinds, in which the headrail is mounted on the ceiling. This application eliminates the gap between the top of the blind and the ceiling. Ceiling mounts are relatively rare.
A ceiling mount uses brackets to mount a blind or shade to the top of the window or ceiling. It can be used to mount horizontal shades and vertical or horizontal blinds, eliminating the gap between the top of the blind and the ceiling. All window coverings can be ceiling mounted with no special hardware required.
Used for vertical blinds, these are brackets specially designed to attach the blind to the ceiling. Thus eliminating the gap between the ceiling and top of the blind.