These parallel-view object array stereograms present a three dimensional image when viewed as though looking through a window. Closer repetitions of objects on the print are 'read' as being closer in space when viewed appropriately.

"Object Array Stereograms are when the 3D is hidden, but not the objects. Most people prefer to be surprised with the discovery of a hidden object within a hidden-image stereogram. With OAS, the surprise comes with discovering hidden layers and object interplay. Where hidden-image stereograms lack definition and detail, Object Array Stereograms can be elaborately and clearly detailed as well as show deeper levels of depth. These are generally more appreciated by experienced viewers."

Gene Levine, ColorStereo.com