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  • Just as an object may move in three perpendicular directions, corresponding to horizontal, vertical, and longitudinal, so an object may participate in three perpendicular futures.

    ALAN LIGHTMAN
  1. black
  2. grey
  3. blue
  4. red
  5. brown
  6. white

Just as an object may move in three perpendicular directions, corresponding to horizontal, vertical, and longitudinal, so an object may participate in three perpendicular futures.