Back Fall; or, Dodge in Hell
Chapters (77)
  1. Title Page
  2. Contents
  3. Dedication
  4. Book 1
  5. Part 1
  6. Chapter 1
  7. Chapter 2
  8. Chapter 3
  9. Chapter 4
  10. Chapter 5
  11. Chapter 6
  12. Chapter 7
  13. Chapter 8
  14. Part 2
  15. Chapter 9
  16. Chapter 10
  17. Chapter 11
  18. Part 3
  19. Chapter 12
  20. Chapter 13
  21. Chapter 14
  22. Chapter 15
  23. Chapter 16
  24. Part 4
  25. Chapter 17
  26. Chapter 18
  27. Chapter 19
  28. Chapter 20
  29. Chapter 21
  30. Chapter 22
  31. Chapter 23
  32. Chapter 24
  33. Part 5
  34. Chapter 25
  35. Chapter 26
  36. Chapter 27
  37. Chapter 28
  38. Chapter 29
  39. Chapter 30
  40. Chapter 31
  41. Chapter 32
  42. Part 6
  43. Chapter 33
  44. Chapter 34
  45. Chapter 35
  46. Chapter 36
  47. Chapter 37
  48. Chapter 38
  49. Chapter 39
  50. Chapter 40
  51. Chapter 41
  52. Part 7
  53. Chapter 42
  54. Book 2
  55. Part 8
  56. Chapter 43
  57. Chapter 44
  58. Part 9
  59. Chapter 45
  60. Chapter 46
  61. Chapter 47
  62. Part 10
  63. Chapter 48
  64. Chapter 49
  65. Part 11
  66. Chapter 50
  67. Chapter 51
  68. Chapter 52
  69. Chapter 53
  70. Chapter 54
  71. Chapter 55
  72. Chapter 56
  73. Map of The Land
  74. Acknowledgments
  75. About The Author
  76. Also By Neal Stephenson
  77. Copyright

The question was largely academic, since El was going to attend whether or not they counted him. Assuming that it was really him controlling the robot, he came to all of the sessions, standing quietly in the back of the room. The Metatron had a built-in speaker, so he could have piped in his voice at any time, but he didn’t use it; on the rare occasions when he wanted to ask a question, he would send it in the form of a brief text. Sometimes, though, the robot could be seen standing in a quiet corner, apparently having a conversation with Sinjin Kerr, Enoch Root, or one of his other advisers.

Sophia’s ACTANSS 3 talk was co-presented with her collaborator Dr. Matilda Napolitano, a mathematical physicist at the University of Bologna. Its title was “Virtual-Space Cartography from Manifold-Based Traffic Analysis.” They staged the presentation on the resort’s tennis court, which was protected from cold and wet by an inflatable dome. They did it just before dinner, as the light was dying outside, but they chose not to turn on the dome’s powerful illumination system, which would have competed with what they wanted to display. Resort staff had taken down the tennis net and scattered a few faint, indirect lights around the place so that the attendees wouldn’t bump into one another. As recently as ten years ago it would have seemed a bizarre setting for a technical presentation, but now everyone understood what it meant: Sophia and Matilda were going to be presenting some visuals, and they’d be using augmented reality to do it, and this would all be easier if people could stroll freely through whatever three-dimensional imagery was going to be projected into this space.

The opening graphics were two-dimensional, however. Sophia caused them to appear on a virtual screen at one end of the tennis court, so that all of the attendees were at first facing in the same direction.

She started with a map of Europe, the national borders curiously wrong until a caption came up identifying it as the Europe of 1941.

“As a way of introducing this subject matter to people who, like me, are not mathematical physicists, I wanted to make an analogy to how the world looked to Allied codebreakers in the early part of the Second World War, before they had broken the German codes,” Sophia began.

The map began to move, panning and zooming to focus on Great Britain. Cartoon installations began to pop up at various locations on the island: little icons, each consisting of a small building with an antenna on its roof, swiveling this way and that, but mostly pointed east and south toward Axis-controlled Europe.

“They couldn’t read the actual content of the messages, but they could still copy them down. And through a technology called high-frequency direction finding, or huffduff, they could figure out where each transmission originated.”