Impossible Names

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Across
  1. 4. "A logical contradiction that impossible shapes often demonstrate.",
  2. 7. "An artist famous for using impossible shapes in his artwork.",
  3. 8. "Another name for the Penrose Triangle.",
  4. 9. "An ambiguous cube that flips perspectives.",
  5. 12. "Another name for the Devil's Fork.",
  6. 14. "A cube-like figure that seems to have contradictory connections.",
  7. 15. "A technique that creates a visual illusion in art.",
Down
  1. 1. "A three-pronged fork that visually defies geometry.",
  2. 2. "An impossible shape resembling a three-pronged fork.",
  3. 3. "A staircase that loops endlessly upwards or downwards.",
  4. 5. "A type of illusion where perception shifts between two interpretations.",
  5. 6. "A general term for shapes that defy geometric logic.",
  6. 10. "A famous impossible triangle that appears to defy geometry.",
  7. 11. "A mathematician who studied impossible figures.",
  8. 13. "A kind of illusion that tricks the eye into seeing the impossible.",