There was a requirement at the National Theatre for mounting a spotlight projector to project images on the tower.
The problem was that the theater is a listed building and during the day the spotlight would have been visible above the parapet which was not acceptable. The solution was to mount the light on a Tecmach low profile scissor lift table to raise the light at night to the position required for projecting the image on the tower and during the day lower it behind the parapet.