superimposition

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superimposition 

The ability to see two similar images superimposed but not mentally fused. Examples: seeing a bird in a cage with both eyes in a synoptophore when one eye is presented with a bird and the other with a cage; seeing the letter E in a synoptophore when one eye is presented with the letter F and the other with the letter L. See Worth's classification of binocular vision.
References in periodicals archive ?
Once students master the color key, they can learn how to distribute the color key to multiple focus areas on the stage.
The color keys were inadvertently reversed on the following graphs.
Over 250 pieces of concept art from Toy Story 3 pack a survey filled with storyboards, color keys, reference photos and much more