[dodar]

Originally Posted by Jon Stratis

The view point doesn't matter. Horizontal and vertical are constants, defined with respect to level ground. If you lay on your back on the floor, do you suddenly say that the floor is vertical and the walls are horizontal, just because your perspective has changed?

Laying down and looking out of your own eyes, then yes the floor is now vertical and the walls are horizontal because that is your perspective. But looking at it in the perspective of someone else looking at a robot, then no it never changes because your perspective isnt changing when the robot moves.