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"The stimulus arrangement for the side view consisted of a black square with a white bullseye target measuring 3 & 3/4 inches in diameter. This target was mounted on the surface of the right [inner] side of the chamber. The black square appeared darker in hue than the black interior surface of the chamber." Experiment Error "It can be seen from the drawing of the experimental set up that should a viewer position himself directly in front of the [front] target opening, say about 1 foot back, he would naturally perceive three colored overlapping targets receding from the front. "However, when the target box was set up, it was placed on two folding chairs, the back of the front chair obscuring nearly 50% of a direct frontal view of this target window. This was not noticed at the time." Results "A frontal view of [front] target 1 should have presented a series of receding, overlapping, colored squares. Ingo’s drawing, however, shows only part of the front square denoted as red. This view was possible only from the lower left corner of the window. Ingo did not "see" the chair back inadvertently blocking the right half of the window. The photo taken after the experiment from the lower left corner of the window shows that only the red corner of the