If you consider that a mirror is doing nothing but reflecting light (visual data), and the objects that are reflecting/emitting light into the mirror are positioned at different distances and orientations relative to the mirror. Accordingly, the signals we would perceive from the light off those objects (i.e. color, shape, depth) is still reaching our eye, but is just reflecting off the mirror first. The information in that light is largely unchanged, allowing us to still determine closer and farther objects, the color of objects, and focus on them individually.
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