3 ms·

I always preferred the blunt "pull this part back to yesterday, when the knot wasn't, move it over here, bring it back to today, and it's unknotted" argument.

• rms 17y ago
  That's treating the 4th dimension as time, which is fine, but this article is referring specifically to the 4th spatial dimension. Sometimes pop physics type articles confusingly refer to the 4th spatial dimension as the 5th dimension.
  • kschults 17y ago
    What exactly is the 4th spacial dimension? Since we only experience space in three dimensions, how can we assign meaning to a fourth dimension in space?
    • secret 17y ago
      These may help visualize 4D space: http://en.wikipedia.org/wiki/Fourth_dimension http://en.wikipedia.org/wiki/Fourth_dimension http://www.instructables.com/id/How_to_draw_a_4_dimension_cube/ http://www.instructables.com/id/How_to_draw_a_4_dimension_cu...
      • rms 17y ago
        The classic Flatland also helps. http://www.geom.uiuc.edu/~banchoff/Flatland/ http://www.geom.uiuc.edu/~banchoff/Flatland/
    • anigbrowl 17y ago
      http://www.superliminal.com/cube/cube.htm http://www.superliminal.com/cube/cube.htm
  • anigbrowl 17y ago
    One might just as easily say that it's treating time as a 4th spatial dimension (offering a further 2 degrees of freedom, when our actual experience of time seems to be sadly one way, unless you read pravda). What he's suggesting is not substantively different from the color analogy.