Yesterday
  Whither?
  An Interactive Fiction
  Release 1 / Serial number 150512 / Inform 7 build 6M22 (I6/v6.33 lib 6/12N) SD
  
  Yesterday
  Nearby a temporal vortex leads west.
  
> >   Today
  (Testing.)
  
  >[1] examine west door
  You see nothing special about the temporal vortex.
  
  >[2] x east door
  There is no door in that direction.
  
  >[3] w
  
  Today
  Nearby a temporal vortex leads east to Yesterday.
  
  >[4] x w door
  There is no door in that direction.
  
  >[5] x e door
  You see nothing special about the temporal vortex.
  
  >[6] tie me to the west door
  There is no door in that direction.
  
  >[7] tie the west door to me
  There is no door in that direction.
  
  >[8] push the west door east
  There is no door in that direction.
  
  >[9] push the east door west
  The temporal vortex cannot be pushed from place to place.
  
> >