50

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Across
  1. 4. - Bird reborn from ashes (seven)
  2. 5. - Superman's home planet (seven)
  3. 8. - Art of paper folding (seven)
  4. 12. - Luxury sailing vessel (five)
  5. 13. - Spiritual symbol in Buddhism (seven)
  6. 14. - Four-dimensional cube (nine)
  7. 15. - Unstoppable force (ten)
  8. 16. - Ideal perfect society (six)
  9. 18. - Star nursery (six)
  10. 19. - Impractically idealistic (eight)
  11. 20. - Highest point or state (six)
Down
  1. 1. - Ecstatic expression of feeling (eight)
  2. 2. - Fear of foreigners (ten)
  3. 3. - Climbing flowering plant (eight)
  4. 6. - Short, evocative description (eight)
  5. 7. - Complex maze (nine)
  6. 9. - 3D image projection (eight)
  7. 10. - Flew too close to the sun (six)
  8. 11. - Waterspout sculpture (eight)
  9. 17. - Outline in shadow (ten)