As the large butterfly flew toward Anton, he could tell it was getting closer because he could feel his eyes turning inward toward his nose as he watched it. In this instance, Anton was able to judge how far away the butterfly was using the depth cue of

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Convergence is a depth cue that involves the inward turning of the eyes toward each other as an object gets closer to us. In the scenario described, Anton's eyes turning inward as the butterfly approaches indicates he is using convergence to perceive the butterfly's distance.

As the Large Butterfly Flew Toward Anton, He Could Tell