I start at 0 in both three-coloured and seven-coloured space.
The environment in the respective spaces are [0,1,2] and [0,1,2,3,4,5,6].
I am now at 1 in 3-space and 0 in 7-space.
I am now at 1 in 3-space and 0 in 7-space.
(the above two lines should print the same)
The environment in 3-space is (1,2,0)
The environment in 7-space is (0,1,2,3,4,5,6)
My tape reads:
  STEP3 0 1
  STEP7 0 1
  LEFT
  STEP3 1 0
  STEP7 1 4
  RIGHT
  STEP3 0 1
  STEP7 4 0
  SELF
  SELVES