This simple yet astonishing illustration is an example of an ambiguous figure illusion, taken from an 1832 publication by Louis Albert Necker. The real optical illusion is that you see this as a 3D box when it's just a bunch of lines, highlighting how our brains can't perceive depth due to the lack of shading.
If you're struggling to see the illusion, it may help to focus on the letters at each corner of the object or tilt your head to help your brain readjust. One user mentioned that they can instantly change perspective by alternately imagining the A or X side facing the viewer, showcasing different ways brains can interpret the same image.
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