The interrupted, clear picture wins an atmospheric attraction by the certain distance between the columns (4.2 cm) which is necessary for the rotation. The picture does not impose itself. The imagination of the observer is activated.
So many stage sets can be shown infinitely:
While the audience is being aware of a picture, magnetic strips of a new picture are already liable on the hidden back of the columns and wait to be turned in the light. The inter-PICTURE makes new expression stops of the stage set possible because by turning the columns particularly slowly e.g. an atmosphere transition is possible from a scene (or even from the weather) to the other one.
Which effect do we experience in the gently busy light of the twilight?