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In music, there are certain types of sounds, and patterns of sounds, which are perceived ambiguously. In other words, certain individuals might perceive one pattern or sound, while other individuals might perceive another. More interestingly, an individual may perceive a stimulus as one pattern at one moment, then another pattern the next. As an example in visual perception, Figure 1 shows an image in which two different objects may be perceived. What object do you see in the image?
