(under subclass 436) Device wherein a grid of alternate opaque and transparent areas overlies an artwork composed of alternating sections of two or more pictures, and movement of either the grid or the artwork causes the illusion or effect.
SEE OR SEARCH THIS CLASS, SUBCLASS:
453, for changing exhibitors which vary as an observer changes his location with respect to the exhibitors.
476, for changing exhibitors which utilize motor operated shifting (reciprocating) mechanisms.
