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Geometric Impossible Tessellated Staircase

Vertical 9:16 phone wallpaper of an impossible tessellated staircase of floating cubes forming an optical illusion, precise interlocking geometry bending perception, soft even shading defining each face, the structure centered with quiet space overhead, monochrome blue palette with subtle tonal shifts, hypnotic cerebral mood, no text, no logo, no watermark, no borders.